pagecontent_prhlt.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="http://schema.primaresearch.org/PAGE/gts/pagecontent/2013-07-15" elementFormDefault="qualified" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:pc="http://schema.primaresearch.org/PAGE/gts/pagecontent/2013-07-15">
	
    <element name="PcGts" type="pc:PcGtsType">
		<annotation>
			<documentation>Page Content - Ground Truth and Storage</documentation>
		</annotation></element>
	<complexType name="PcGtsType">
		<sequence>
			<element name="Metadata" type="pc:MetadataType"/>
			<element name="Page" type="pc:PageType"/>
		</sequence>
		<attribute name="pcGtsId" type="ID" use="optional"/>
	</complexType>
	<complexType name="MetadataType">
		<sequence>
			<element name="Creator" type="string"/>
			<element name="Created" type="dateTime">
				<annotation>
					<documentation>The timestamp has to be in UTC (Coordinated Universal Time) and not local time.</documentation></annotation></element>
			<element name="LastChange" type="dateTime">
				<annotation>
					<documentation>The timestamp has to be in UTC (Coordinated Universal Time) and not local time.</documentation></annotation></element>
			<element name="Comments" type="string" minOccurs="0" maxOccurs="1"/>
		</sequence>
	</complexType>
	<complexType name="PageType">
		<sequence>
			<element name="Tag" type="pc:TagType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Property" type="pc:PropertyType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Link" type="pc:LinkType" minOccurs="0" maxOccurs="unbounded"/>
			
			<element name="AlternativeImage" type="pc:AlternativeImageType" minOccurs="0" maxOccurs="unbounded">
				<annotation>
					<documentation>
						Alternative document page images (e.g.
						black-and-white)
					</documentation>
				</annotation>
			</element>
			<element name="Border" type="pc:BorderType" minOccurs="0" maxOccurs="1">
			</element>
			<element name="PrintSpace" type="pc:PrintSpaceType" minOccurs="0" maxOccurs="1">
			</element>
			<element name="ReadingOrder" type="pc:ReadingOrderType" minOccurs="0" maxOccurs="1">
				<annotation>
					<documentation/>
				</annotation>
			</element>
			<element name="Layers" type="pc:LayersType" minOccurs="0" maxOccurs="1">
				<annotation>
					<documentation>Unassigned regions are considered to be in the (virtual) default layer which is to be treated as below any other layers.</documentation>
				</annotation>
			</element>
            <element name="Relations" type="pc:RelationsType" minOccurs="0">
				</element>
            <choice minOccurs="0" maxOccurs="unbounded">
				<element name="TextRegion" type="pc:TextRegionType"/>
				<element name="ImageRegion" type="pc:ImageRegionType">
				</element>
				<element name="LineDrawingRegion" type="pc:LineDrawingRegionType">
				</element>
				<element name="GraphicRegion" type="pc:GraphicRegionType">
				</element>
				<element name="TableRegion" type="pc:TableRegionType">
				</element>
				<element name="ChartRegion" type="pc:ChartRegionType">
				</element>
				<element name="SeparatorRegion" type="pc:SeparatorRegionType">
				</element>
				<element name="MathsRegion" type="pc:MathsRegionType">
				</element>
				<element name="ChemRegion" type="pc:ChemRegionType"/>
				<element name="MusicRegion" type="pc:MusicRegionType"/>
                <element name="AdvertRegion" type="pc:AdvertRegionType">
				</element>
                <element name="NoiseRegion" type="pc:NoiseRegionType">
				</element>
				<element name="UnknownRegion" type="pc:UnknownRegionType">
				</element>
			</choice>

		</sequence>
		<attribute name="imageFilename" type="string" use="required"/>
		<attribute name="imageWidth" type="int" use="required"/>
		<attribute name="imageHeight" type="int" use="required"/>
		<attribute name="custom" type="string">
			<annotation>
				<documentation>For generic use</documentation>
			</annotation>
		</attribute>
		<attribute name="type" type="pc:PageTypeSimpleType">
            <annotation>
            	<documentation>Page type</documentation>
            </annotation>
		</attribute>
	</complexType>
	<complexType name="TextRegionType">
		<annotation>
			<documentation>
				Pure text is represented as a text region. This includes
				drop capitals, but practically ornate text may be
				considered as a graphic.
			</documentation>
		</annotation>
	    <complexContent>
	      <extension base="pc:RegionType">
			<sequence>
				<element name="TextLine" type="pc:TextLineType" minOccurs="0" maxOccurs="unbounded">
				</element>
				<element name="TextEquiv" type="pc:TextEquivType" minOccurs="0" maxOccurs="1">
				</element>
				<element name="TextStyle" type="pc:TextStyleType" minOccurs="0" maxOccurs="1">
				</element>
			</sequence>
			<attribute name="orientation" type="float" use="optional">
				<annotation>
					<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
				</annotation>
			</attribute>
			<attribute name="type" type="pc:TextTypeSimpleType" use="optional">
				<annotation>
					<documentation>
						The nature of the text in the region
					</documentation>
				</annotation>
			</attribute>
			<attribute name="leading" type="int" use="optional">
				<annotation>
					<documentation>
						The degree of space in points between the lines of
						text (line spacing)
					</documentation>
				</annotation>
			</attribute>
			<attribute name="readingDirection" type="pc:ReadingDirectionSimpleType" use="optional">
				<annotation>
					<documentation>
						The direction in which text in a region should be
						read (within lines)
					</documentation>
				</annotation>
			</attribute>
			<attribute name="readingOrientation" type="float" use="optional">
				<annotation>
					<documentation>The angle the baseline of text withing a region has to be rotated (relative to the rectangle encapsulating the region) in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
				</annotation>
			</attribute>
			<attribute name="indented" type="boolean" use="optional">
				<annotation>
					<documentation>
						Defines whether a region of text is indented or not
					</documentation>
				</annotation>
			</attribute>
			<attribute name="align" type="pc:AlignSimpleType">
				<annotation>
					<documentation>Text align</documentation>
				</annotation>
			</attribute>
			<attribute name="primaryLanguage" type="pc:LanguageSimpleType" use="optional">
				<annotation>
					<documentation>
						The primary language used in the region
					</documentation>
				</annotation>
			</attribute>
			<attribute name="secondaryLanguage" type="pc:LanguageSimpleType" use="optional">
				<annotation>
					<documentation>
						The secondary language used in the region
					</documentation>
				</annotation>
			</attribute>
			<attribute name="primaryScript" type="pc:ScriptSimpleType" use="optional">
				<annotation>
					<documentation>
						The primary script used in the region
					</documentation>
				</annotation>
			</attribute>
			<attribute name="secondaryScript" type="pc:ScriptSimpleType" use="optional">
				<annotation>
					<documentation>
						The secondary script used in the region
					</documentation>
				</annotation>
			</attribute>
			<attribute name="production" type="pc:ProductionSimpleType"/>
	      </extension>
	    </complexContent>
	</complexType>
	<complexType name="CoordsType">
		<attribute name="points" use="required" type="pc:PointsType">
            <annotation>
            	<documentation>Point list with format "x1,y1 x2,y2 ..."</documentation>
            </annotation>
		</attribute>
		<attribute name="fpgram" use="optional" type="pc:PointsType">
			<annotation>
				<documentation>Features parallelogram for alignment</documentation>
			</annotation>
		</attribute>
		<attribute name="fcontour" use="optional" type="pc:PointsType">
			<annotation>
				<documentation>Features contour</documentation>
			</annotation>
		</attribute>
		<attribute name="slope" use="optional" type="float">
			<annotation>
				<documentation>Slope angle of text line</documentation>
			</annotation>
		</attribute>
		<attribute name="slant" use="optional" type="float">
			<annotation>
				<documentation>Slant angle of text line</documentation>
			</annotation>
		</attribute>
	</complexType>
	<complexType name="TextLineType">
		<sequence>
			<element name="Tag" type="pc:TagType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Property" type="pc:PropertyType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Link" type="pc:LinkType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Coords" type="pc:CoordsType" minOccurs="0"/>
			<element name="Baseline" type="pc:BaselineType" minOccurs="0">
				<annotation>
					<documentation>
						Multiple connected points that mark the baseline
						of the glyphs from left to right
					</documentation>
				</annotation>
			</element>
			<element name="Word" type="pc:WordType" minOccurs="0" maxOccurs="unbounded">
			</element>
			<element name="TextEquiv" type="pc:TextEquivType" minOccurs="0" maxOccurs="1">
			</element>
			<element name="TextStyle" type="pc:TextStyleType" minOccurs="0"/>
		</sequence>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="orig-id" type="string"/>
		<attribute name="primaryLanguage" type="pc:LanguageSimpleType">
			<annotation>
				<documentation>
					Overrides primaryLanguage attribute of parent text
					region
				</documentation>
			</annotation>
		</attribute>
		<attribute name="production" type="pc:ProductionSimpleType">
			<annotation>
				<documentation>
					Overrides the production attribute of the parent
					text region
				</documentation>
			</annotation>
		</attribute>
		<attribute name="custom" type="string">
			<annotation>
				<documentation>For generic use</documentation>
			</annotation>
		</attribute>
		<attribute name="comments" type="string"/>
		<attribute name="protected" type="string"/>
	</complexType>
	<complexType name="WordType">
		<sequence>
			<element name="Tag" type="pc:TagType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Property" type="pc:PropertyType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Link" type="pc:LinkType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Coords" type="pc:CoordsType"/>
			<element name="Glyph" type="pc:GlyphType" minOccurs="0" maxOccurs="unbounded">
			</element>
			<element name="TextEquiv" type="pc:TextEquivType" minOccurs="0" maxOccurs="1">
			</element>
			<element name="TextStyle" type="pc:TextStyleType" minOccurs="0"/>
		</sequence>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="language" type="pc:LanguageSimpleType">
			<annotation>
				<documentation>
					Overrides primaryLanguage attribute of parent line
					and/or text region
				</documentation>
			</annotation>
		</attribute>
		<attribute name="production" type="pc:ProductionSimpleType">
			<annotation>
				<documentation>
					Overrides the production attribute of the parent
					text line and/or text region.
				</documentation>
			</annotation>
		</attribute>
		<attribute name="custom" type="string">
			<annotation>
				<documentation>For generic use</documentation>
			</annotation>
		</attribute>
		<attribute name="comments" type="string"/>
		<attribute name="protected" type="string"/>
	</complexType>
	<complexType name="GlyphType">
		<sequence>
			<element name="Tag" type="pc:TagType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Property" type="pc:PropertyType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Link" type="pc:LinkType" minOccurs="0" maxOccurs="unbounded"/>
			<element name="Coords" type="pc:CoordsType"/>
			<element name="TextEquiv" type="pc:TextEquivType" minOccurs="0" maxOccurs="1">
			</element>
			<element name="TextStyle" type="pc:TextStyleType" minOccurs="0"/>
		</sequence>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="ligature" use="optional" type="boolean">
		</attribute>
		<attribute name="symbol" use="optional" type="boolean">
		</attribute>
		<attribute name="production" type="pc:ProductionSimpleType">
			<annotation>
				<documentation>
					Overrides the production attribute of the parent
					word / text line / text region.
				</documentation>
			</annotation>
		</attribute>
		<attribute name="custom" type="string">
			<annotation>
				<documentation>For generic use</documentation>
			</annotation>
		</attribute>
		<attribute name="comments" type="string"/>
		<attribute name="protected" type="string"/>
	</complexType>
	<complexType name="TextEquivType">
		<sequence>
			<element name="PlainText" type="string" minOccurs="0">
				<annotation>
					<documentation>
						Text in a "simple" form (ASCII or extended ASCII
						as mostly used for typing). I.e. no use of
						special characters for ligatures (should be
						stored as two separate characters) etc.
					</documentation>
				</annotation>
			</element>
			<element name="Unicode" type="string">
				<annotation>
					<documentation>
						Correct encoding of the original, always using
						the corresponding Unicode code point. I.e.
						ligatures have to be represented as one
						character etc.
					</documentation>
				</annotation>
			</element>
		</sequence>
		<attribute name="conf">
			<annotation>
				<documentation>OCR confidence value (between 0 and 1 inclusive)</documentation>
			</annotation>
			<simpleType>
				<restriction base="float">
					<minInclusive value="0"/>
					<maxInclusive value="1"/>
				</restriction>
			</simpleType>
		</attribute>
	</complexType>
	<complexType name="ImageRegionType">
		<annotation>
			<documentation>
				An image is considered to be more intricate and complex
				than a graphic. These can be photos or drawings.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="colourDepth" type="pc:ColourDepthSimpleType" use="optional">
					<annotation>
						<documentation>
							The colour bit depth required for the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="embText" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies whether the region also contains
							text
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="LineDrawingRegionType">
		<annotation>
			<documentation>
				A line drawing is a single colour illustration without
				solid areas.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="penColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The pen (foreground) colour of the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="embText" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies whether the region also contains
							text
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="GraphicRegionType">
		<annotation>
			<documentation>
				Regions containing simple graphics, such as a company
				logo, should be marked as graphic regions.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="type" use="optional" type="pc:GraphicsTypeSimpleType">
					<annotation>
						<documentation>
							The type of graphic in the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="numColours" type="int" use="optional">
					<annotation>
						<documentation>
							An approximation of the number of colours
							used in the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="embText" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies whether the region also contains
							text.
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="TableRegionType">
		<annotation>
			<documentation>
				Tabular data in any form is represented with a table
				region. Rows and columns may or may not have separator
				lines; these lines are not separator regions.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="rows" type="int" use="optional">
					<annotation>
						<documentation>
							The number of rows present in the table
						</documentation>
					</annotation>
				</attribute>
				<attribute name="columns" type="int" use="optional">
					<annotation>
						<documentation>
							The number of columns present in the table
						</documentation>
					</annotation>
				</attribute>
				<attribute name="lineColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The colour of the lines used in the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="lineSeparators" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies the presence of line separators
						</documentation>
					</annotation>
				</attribute>
				<attribute name="embText" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies whether the region also contains
							text
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="ChartRegionType">
		<annotation>
			<documentation>
				Regions containing charts or graphs of any type, should
				be marked as chart regions.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="type" use="optional" type="pc:ChartTypeSimpleType">
					<annotation>
						<documentation>
							The type of chart in the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="numColours" type="int" use="optional">
					<annotation>
						<documentation>
							An approximation of the number of colours
							used in the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
				<attribute name="embText" type="boolean" use="optional">
					<annotation>
						<documentation>
							Specifies whether the region also contains
							text
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="SeparatorRegionType">
		<annotation>
			<documentation>
				Separators are lines that lie between columns and
				paragraphs and can be used to logically separate
				different articles from each other.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="colour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The colour of the separator
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="MathsRegionType">
		<annotation>
			<documentation>
				Regions containing equations and mathematical symbols
				should be marked as maths regions.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="ChemRegionType">
		<annotation>
			<documentation>
				Regions containing chemical formulas.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>
							The angle the rectangle encapsulating a
							region has to be rotated in clockwise
							direction in order to correct the present
							skew (negative values indicate
							anti-clockwise rotation). Range:
							-179.999,180
						</documentation>
					</annotation>
				</attribute>

				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>

			</extension>
		</complexContent>
	</complexType>
	<complexType name="MusicRegionType">
		<annotation>
			<documentation>
				Regions containing musical notations.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="AdvertRegionType">
		<annotation>
			<documentation>
				Regions containing advertisements.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType">
				<attribute name="orientation" type="float" use="optional">
					<annotation>
						<documentation>The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation).
Range: -179.999,180
						</documentation>
					</annotation>
				</attribute>
				<attribute name="bgColour" type="pc:ColourSimpleType" use="optional">
					<annotation>
						<documentation>
							The background colour of the region
						</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="NoiseRegionType">
		<annotation>
			<documentation>
				Noise regions are regions where no real data lies, only
				false data created by artifacts on the document or
				scanner noise.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType"/>
		</complexContent>
	</complexType>
	<complexType name="UnknownRegionType">
		<annotation>
			<documentation>
				To be used if the region type cannot be ascertained.
			</documentation>
		</annotation>
		<complexContent>
			<extension base="pc:RegionType"/>
		</complexContent>
	</complexType>

	<complexType name="PrintSpaceType">
        <annotation>
        	<documentation>Determines the effective area on the paper of a printed page. Its size is equal for all pages of a book (exceptions: titlepage, multipage pictures).
It contains all living elements (except marginals) like body type, footnotes, headings, running titles.
It does not contain pagenumber (if not part of running title), marginals, signature mark, preview words.
</documentation>
        </annotation>
        <sequence>
			<element name="Coords" type="pc:CoordsType"/>
		</sequence>
	</complexType>

	<complexType name="ReadingOrderType">
        <annotation>
        	<documentation>Definition of the reading order within the page. To express a reading order between elements they have to be included in an OrderedGroup. Groups may contain further groups.</documentation>
        </annotation>
        <choice minOccurs="1" maxOccurs="1">
            <element name="OrderedGroup" type="pc:OrderedGroupType"/>
            <element name="UnorderedGroup" type="pc:UnorderedGroupType"/>
		</choice>
	</complexType>

	<complexType name="RegionRefIndexedType">
        <annotation>
        	<documentation>Numbered region</documentation>
        </annotation>
        <attribute name="index" type="int" use="required">
			<annotation>
				<documentation>Position (order number) of this item within the current hierarchy level.</documentation>
			</annotation></attribute>
        <attribute name="regionRef" type="IDREF" use="required"/>
	</complexType>

	<complexType name="OrderedGroupIndexedType">
		<annotation>
			<documentation>
				Indexed group containing ordered elements
			</documentation>
		</annotation>
		<choice minOccurs="1" maxOccurs="unbounded">
			<element name="RegionRefIndexed" type="pc:RegionRefIndexedType">
			</element>
			<element name="OrderedGroupIndexed" type="pc:OrderedGroupIndexedType">
			</element>
			<element name="UnorderedGroupIndexed" type="pc:UnorderedGroupIndexedType">
			</element>
		</choice>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="index" type="int" use="required">
			<annotation>
				<documentation>
					Position (order number) of this item within the
					current hierarchy level.
				</documentation>
			</annotation>
		</attribute>
		<attribute name="caption" type="string"/>
	</complexType>

	<complexType name="UnorderedGroupIndexedType">
		<annotation>
			<documentation>
				Indexed group containing unordered elements
			</documentation>
		</annotation>
		<choice minOccurs="1" maxOccurs="unbounded">
			<element name="RegionRef" type="pc:RegionRefType"/>
			<element name="OrderedGroup" type="pc:OrderedGroupType"/>
			<element name="UnorderedGroup" type="pc:UnorderedGroupType">
			</element>
		</choice>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="index" type="int" use="required">
			<annotation>
				<documentation>
					Position (order number) of this item within the
					current hierarchy level.
				</documentation>
			</annotation>
		</attribute>
		<attribute name="caption" type="string"/>
	</complexType>

	<complexType name="RegionRefType">
		<attribute name="regionRef" type="IDREF" use="required"/>
	</complexType>

	<complexType name="OrderedGroupType">
		<annotation>
			<documentation>
				Numbered group (contains ordered elements)
			</documentation>
		</annotation>
		<choice minOccurs="1" maxOccurs="unbounded">
			<element name="RegionRefIndexed" type="pc:RegionRefIndexedType">
			</element>
			<element name="OrderedGroupIndexed" type="pc:OrderedGroupIndexedType">
			</element>
			<element name="UnorderedGroupIndexed" type="pc:UnorderedGroupIndexedType">
			</element>
		</choice>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="caption" type="string"/>
	</complexType>

	<complexType name="UnorderedGroupType">
		<annotation>
			<documentation>
				Numbered group (contains unordered elements)
			</documentation>
		</annotation>
		<choice minOccurs="1" maxOccurs="unbounded">
			<element name="RegionRef" type="pc:RegionRefType"/>
			<element name="OrderedGroup" type="pc:OrderedGroupType"/>
			<element name="UnorderedGroup" type="pc:UnorderedGroupType">
			</element>
		</choice>
		<attribute name="id" type="ID" use="required"/>
		<attribute name="caption" type="string"/>
	</complexType>

	<complexType name="BorderType">
        <annotation>
        	<documentation>Border of the actual page (if the scanned image contains parts not belonging to the page).</documentation>
        </annotation>
        <sequence>
			<element name="Coords" type="pc:CoordsType"/>
		</sequence>
    </complexType>
    <simpleType name="ColourSimpleType">
    	<restriction base="string">
    		<enumeration value="black"/>
    		<enumeration value="blue"/>
    		<enumeration value="brown"/>
    		<enumeration value="cyan"/>
    		<enumeration value="green"/>
    		<enumeration value="grey"/>
    		<enumeration value="indigo"/>
    		<enumeration value="magenta"/>
    		<enumeration value="orange"/>
    		<enumeration value="pink"/>
    		<enumeration value="red"/>
    		<enumeration value="turquoise"/>
    		<enumeration value="violet"/>
    		<enumeration value="white"/>
    		<enumeration value="yellow"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>
    <simpleType name="ReadingDirectionSimpleType">
    	<restriction base="string">
    		<enumeration value="left-to-right"/>
    		<enumeration value="right-to-left"/>
    		<enumeration value="top-to-bottom"/>
    		<enumeration value="bottom-to-top"/>
    	</restriction>
    </simpleType>
    <simpleType name="TextTypeSimpleType">
    	<restriction base="string">
    		<enumeration value="paragraph"/>
    		<enumeration value="heading"/>
    		<enumeration value="caption"/>
    		<enumeration value="header"/>
    		<enumeration value="footer"/>
    		<enumeration value="page-number"/>
    		<enumeration value="drop-capital"/>
    		<enumeration value="credit"/>
    		<enumeration value="floating"/>
    		<enumeration value="signature-mark"/>
    		<enumeration value="catch-word"/>
    		<enumeration value="marginalia"/>
    		<enumeration value="footnote"/>
    		<enumeration value="footnote-continued"/>
    		<enumeration value="endnote"/>
    		<enumeration value="TOC-entry"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>
    <simpleType name="PageTypeSimpleType">
  			<restriction base="string">
			<enumeration value="front-cover"/>
			<enumeration value="back-cover"/>
			<enumeration value="title"/>
			<enumeration value="table-of-contents"/>
			<enumeration value="index"/>
			<enumeration value="content"/>
			<enumeration value="blank"/>
			<enumeration value="other"/>
		</restriction>
    </simpleType>
    
    <simpleType name="LanguageSimpleType">
    	<restriction base="string">
<enumeration value="Abkhaz"/>
<enumeration value="Afar"/>
<enumeration value="Afrikaans"/>
<enumeration value="Akan"/>
<enumeration value="Albanian"/>
<enumeration value="Amharic"/>
<enumeration value="Arabic"/>
<enumeration value="Aragonese"/>
<enumeration value="Armenian"/>
<enumeration value="Assamese"/>
<enumeration value="Avaric"/>
<enumeration value="Avestan"/>
<enumeration value="Aymara"/>
<enumeration value="Azerbaijani"/>
<enumeration value="Bambara"/>
<enumeration value="Bashkir"/>
<enumeration value="Basque"/>
<enumeration value="Belarusian"/>
<enumeration value="Bengali"/>
<enumeration value="Bihari"/>
<enumeration value="Bislama"/>
<enumeration value="Bosnian"/>
<enumeration value="Breton"/>
<enumeration value="Bulgarian"/>
<enumeration value="Burmese"/>
<enumeration value="Cambodian"/>
<enumeration value="Cantonese"/>
<enumeration value="Catalan"/>
<enumeration value="Chamorro"/>
<enumeration value="Chechen"/>
<enumeration value="Chichewa"/>
<enumeration value="Chinese"/>
<enumeration value="Chuvash"/>
<enumeration value="Cornish"/>
<enumeration value="Corsican"/>
<enumeration value="Cree"/>
<enumeration value="Croatian"/>
<enumeration value="Czech"/>
<enumeration value="Danish"/>
<enumeration value="Divehi"/>
<enumeration value="Dutch"/>
<enumeration value="Dzongkha"/>
<enumeration value="English"/>
<enumeration value="Esperanto"/>
<enumeration value="Estonian"/>
<enumeration value="Ewe"/>
<enumeration value="Faroese"/>
<enumeration value="Fijian"/>
<enumeration value="Finnish"/>
<enumeration value="French"/>
<enumeration value="Fula"/>
<enumeration value="Gaelic"/>
<enumeration value="Galician"/>
<enumeration value="Ganda"/>
<enumeration value="Georgian"/>
<enumeration value="German"/>
<enumeration value="Greek"/>
<enumeration value="Guaraní"/>
<enumeration value="Gujarati"/>
<enumeration value="Haitian"/>
<enumeration value="Hausa"/>
<enumeration value="Hebrew"/>
<enumeration value="Herero"/>
<enumeration value="Hindi"/>
<enumeration value="Hiri Motu"/>
<enumeration value="Hungarian"/>
<enumeration value="Icelandic"/>
<enumeration value="Ido"/>
<enumeration value="Igbo"/>
<enumeration value="Indonesian"/>
<enumeration value="Interlingua"/>
<enumeration value="Interlingue"/>
<enumeration value="Inuktitut"/>
<enumeration value="Inupiaq"/>
<enumeration value="Irish"/>
<enumeration value="Italian"/>
<enumeration value="Japanese"/>
<enumeration value="Javanese"/>
<enumeration value="Kalaallisut"/>
<enumeration value="Kannada"/>
<enumeration value="Kanuri"/>
<enumeration value="Kashmiri"/>
<enumeration value="Kazakh"/>
<enumeration value="Khmer"/>
<enumeration value="Kikuyu"/>
<enumeration value="Kinyarwanda"/>
<enumeration value="Kirundi"/>
<enumeration value="Komi"/>
<enumeration value="Kongo"/>
<enumeration value="Korean"/>
<enumeration value="Kurdish"/>
<enumeration value="Kwanyama"/>
<enumeration value="Kyrgyz"/>
<enumeration value="Lao"/>
<enumeration value="Latin"/>
<enumeration value="Latvian"/>
<enumeration value="Limburgish"/>
<enumeration value="Lingala"/>
<enumeration value="Lithuanian"/>
<enumeration value="Luba-Katanga"/>
<enumeration value="Luxembourgish"/>
<enumeration value="Macedonian"/>
<enumeration value="Malagasy"/>
<enumeration value="Malay"/>
<enumeration value="Malayalam"/>
<enumeration value="Maltese"/>
<enumeration value="Manx"/>
<enumeration value="Māori"/>
<enumeration value="Marathi"/>
<enumeration value="Marshallese"/>
<enumeration value="Mongolian"/>
<enumeration value="Nauru"/>
<enumeration value="Navajo"/>
<enumeration value="Ndonga"/>
<enumeration value="Nepali"/>
<enumeration value="North Ndebele"/>
<enumeration value="Northern Sami"/>
<enumeration value="Norwegian"/>
<enumeration value="Norwegian Bokmål"/>
<enumeration value="Norwegian Nynorsk"/>
<enumeration value="Nuosu"/>
<enumeration value="Occitan"/>
<enumeration value="Ojibwe"/>
<enumeration value="Old Church Slavonic"/>
<enumeration value="Oriya"/>
<enumeration value="Oromo"/>
<enumeration value="Ossetian"/>
<enumeration value="Pāli"/>
<enumeration value="Panjabi"/>
<enumeration value="Pashto"/>
<enumeration value="Persian"/>
<enumeration value="Polish"/>
<enumeration value="Portuguese"/>
<enumeration value="Punjabi"/>
<enumeration value="Quechua"/>
<enumeration value="Romanian"/>
<enumeration value="Romansh"/>
<enumeration value="Russian"/>
<enumeration value="Samoan"/>
<enumeration value="Sango"/>
<enumeration value="Sanskrit"/>
<enumeration value="Sardinian"/>
<enumeration value="Serbian"/>
<enumeration value="Shona"/>
<enumeration value="Sindhi"/>
<enumeration value="Sinhala"/>
<enumeration value="Slovak"/>
<enumeration value="Slovene"/>
<enumeration value="Somali"/>
<enumeration value="South Ndebele"/>
<enumeration value="Southern Sotho"/>
<enumeration value="Spanish"/>
<enumeration value="Sundanese"/>
<enumeration value="Swahili"/>
<enumeration value="Swati"/>
<enumeration value="Swedish"/>
<enumeration value="Tagalog"/>
<enumeration value="Tahitian"/>
<enumeration value="Tajik"/>
<enumeration value="Tamil"/>
<enumeration value="Tatar"/>
<enumeration value="Telugu"/>
<enumeration value="Thai"/>
<enumeration value="Tibetan"/>
<enumeration value="Tigrinya"/>
<enumeration value="Tonga"/>
<enumeration value="Tsonga"/>
<enumeration value="Tswana"/>
<enumeration value="Turkish"/>
<enumeration value="Turkmen"/>
<enumeration value="Twi"/>
<enumeration value="Uighur"/>
<enumeration value="Ukrainian"/>
<enumeration value="Urdu"/>
<enumeration value="Uzbek"/>
<enumeration value="Venda"/>
<enumeration value="Vietnamese"/>
<enumeration value="Volapük"/>
<enumeration value="Walloon"/>
<enumeration value="Welsh"/>
<enumeration value="Western Frisian"/>
<enumeration value="Wolof"/>
<enumeration value="Xhosa"/>
<enumeration value="Yiddish"/>
<enumeration value="Yoruba"/>
<enumeration value="Zhuang"/>
<enumeration value="Zulu"/>
<enumeration value="other"/>
    	</restriction>
    </simpleType>
    
    <simpleType name="ScriptSimpleType">
    	<restriction base="string">
    		<enumeration value="Arabic"/>
    		<enumeration value="Bengali"/>
    		<enumeration value="Chinese-simplified"/>
    		<enumeration value="Chinese-traditional"/>
    		<enumeration value="Cyrillic"/>
    		<enumeration value="Devangari"/>
    		<enumeration value="Ethiopic"/>
    		<enumeration value="Greek"/>
    		<enumeration value="Gujarati"/>
    		<enumeration value="Gurmukhi"/>
    		<enumeration value="Hebrew"/>
    		<enumeration value="Latin"/>
    		<enumeration value="Thai"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>
    <simpleType name="ColourDepthSimpleType">
    	<restriction base="string">
    		<enumeration value="bilevel"/>
    		<enumeration value="greyscale"/>
    		<enumeration value="colour"/>
     		<enumeration value="other"/>
    	</restriction>
    </simpleType>
    <simpleType name="GraphicsTypeSimpleType">
    	<restriction base="string">
    		<enumeration value="logo"/>
    		<enumeration value="letterhead"/>
    		<enumeration value="decoration"/>
    		<enumeration value="frame"/>
    		<enumeration value="handwritten-annotation"/>
    		<enumeration value="stamp"/>
    		<enumeration value="signature"/>
    		<enumeration value="barcode"/>
    		<enumeration value="paper-grow"/>
    		<enumeration value="punch-hole"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>
    <simpleType name="ChartTypeSimpleType">
    	<restriction base="string">
    		<enumeration value="bar"/>
    		<enumeration value="line"/>
    		<enumeration value="pie"/>
    		<enumeration value="scatter"/>
    		<enumeration value="surface"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>

    <complexType name="LayersType">
    	<annotation>
    		<documentation>
    			Can be used to express the z-index of overlapping
    			regions. An element with a greater z-index is always in
    			front of another element with lower z-index.
    		</documentation>
    	</annotation>
    	<sequence minOccurs="1" maxOccurs="unbounded">
    		<element name="Layer" type="pc:LayerType"/>
    	</sequence>
    </complexType>
    

    <complexType name="LayerType">
    	<sequence minOccurs="1" maxOccurs="unbounded">
    		<element name="RegionRef" type="pc:RegionRefType"/>
    	</sequence>
    	<attribute name="id" type="ID" use="required"/>
    	<attribute name="zIndex" type="int" use="required"/>
    	<attribute name="caption" type="string"/>
    </complexType>

    
    <complexType name="BaselineType">
    	<attribute name="points" type="pc:PointsType" use="required"/>
    </complexType>


    <simpleType name="PointsType">
        <annotation>
        	<documentation>Point list with format "x1,y1 x2,y2 ..."</documentation>
        </annotation>
        <restriction base="string">
    		<pattern value="([-.0-9]+,[-.0-9]+ )+([-.0-9]+,[-.0-9]+)"/>
    	</restriction>
    </simpleType>

    <complexType name="RelationsType">
    	<annotation>
    		<documentation>
    			Container for one-to-one relations between layout
    			objects (for example: DropCap - paragraph, caption -
    			image)
    		</documentation>
    	</annotation>
    	<sequence minOccurs="1" maxOccurs="unbounded">
    		<element name="Relation" type="pc:RelationType"/>
    	</sequence>
    </complexType>

    <complexType name="RelationType">
    	<annotation>
    		<documentation>
    			One-to-one relation between to layout object. Use 'link'
    			for loose relations and 'join' for strong relations
    			(where something is fragmented for instance).

    			Examples for 'link': caption - image floating -
    			paragraph paragraph - paragraph (when a pragraph is
    			split across columns and the last word of the first
    			paragraph DOES NOT continue in the second paragraph)
    			drop-cap - paragraph (when the drop-cap is a whole word)

    			Examples for 'join': word - word (separated word at the
    			end of a line) drop-cap - paragraph (when the drop-cap
    			is not a whole word) paragraph - paragraph (when a
    			pragraph is split across columns and the last word of
    			the first paragraph DOES continue in the second
    			paragraph)
    		</documentation>
    	</annotation>
    	<sequence minOccurs="2" maxOccurs="2">
    		<element name="RegionRef" type="pc:RegionRefType"/>
    	</sequence>
    	<attribute name="type" use="required">
    		<simpleType>
    			<restriction base="string">
    				<enumeration value="link"/>
    				<enumeration value="join"/>
    			</restriction>
    		</simpleType>
    	</attribute>
        <attribute name="custom" type="string">
    		<annotation>
    			<documentation>For generic use</documentation></annotation></attribute>
        <attribute name="comments" type="string"/>
    </complexType>

    <simpleType name="ProductionSimpleType">
        <annotation>
        	<documentation>Text production type</documentation>
        </annotation>
        <restriction base="string">
    		<enumeration value="printed"/>
    		<enumeration value="typewritten"/>
    		<enumeration value="handwritten-cursive"/>
    		<enumeration value="handwritten-printscript"/>
    		<enumeration value="medieval-manuscript"/>
    		<enumeration value="other"/>
    	</restriction>
    </simpleType>

    <complexType name="TextStyleType">
    	<annotation>
    		<documentation>
    			Monospace (fixed-pitch, non-proportional) or
    			proportional font
    		</documentation>
    	</annotation>
    	<attribute name="fontFamily" type="string">
    		<annotation>
    			<documentation>
    				For instance: Arial, Times New Roman. Add more
    				information if necessary (e.g. blackletter,
    				antiqua).
    			</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="serif" type="boolean">
    		<annotation>
    			<documentation>
    				Serif or sans-serif typeface
    			</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="monospace" type="boolean"/>
    	<attribute name="fontSize" type="float">
    		<annotation>
    			<documentation>
    				The size of the characters in points
    			</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="kerning" type="int">
    		<annotation>
    			<documentation>
    				The degree of space (in points) between the
    				characters in a string of text
    			</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="textColour" type="pc:ColourSimpleType"/>
    	<attribute name="bgColour" type="pc:ColourSimpleType">
    		<annotation>
    			<documentation>Background colour</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="reverseVideo" type="boolean">
    		<annotation>
    			<documentation>
    				Specifies whether the colour of the text appears
    				reversed against a background colour
    			</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="bold" type="boolean"/>
    	<attribute name="italic" type="boolean"/>
    	<attribute name="underlined" type="boolean"/>
    	<attribute name="subscript" type="boolean"/>
    	<attribute name="superscript" type="boolean"/>
    	<attribute name="strikethrough" type="boolean"/>
        <attribute name="smallCaps" type="boolean"/>
        <attribute name="letterSpaced" type="boolean"/>
    </complexType>

    <complexType name="RegionType" abstract="true">
    	<sequence>
    		<element name="Tag" type="pc:TagType" minOccurs="0" maxOccurs="unbounded"/>
    		<element name="Property" type="pc:PropertyType" minOccurs="0" maxOccurs="unbounded"/>
    		<element name="Link" type="pc:LinkType" minOccurs="0" maxOccurs="unbounded"/>
    		<element name="Coords" type="pc:CoordsType"/>
    		<choice minOccurs="0" maxOccurs="unbounded">
    			<element name="TextRegion" type="pc:TextRegionType"/>
    			<element name="ImageRegion" type="pc:ImageRegionType"/>
    			<element name="LineDrawingRegion" type="pc:LineDrawingRegionType">
    			</element>
    			<element name="GraphicRegion" type="pc:GraphicRegionType">
    			</element>
    			<element name="TableRegion" type="pc:TableRegionType"/>
    			<element name="ChartRegion" type="pc:ChartRegionType"/>
    			<element name="SeparatorRegion" type="pc:SeparatorRegionType">
    			</element>
    			<element name="MathsRegion" type="pc:MathsRegionType"/>
    			<element name="ChemRegion" type="pc:ChemRegionType"/>
    			<element name="MusicRegion" type="pc:MusicRegionType"/>
                <element name="AdvertRegion" type="pc:AdvertRegionType">
    			</element>
                <element name="NoiseRegion" type="pc:NoiseRegionType"/>
    			<element name="UnknownRegion" type="pc:UnknownRegionType"/>
    		</choice>
    	</sequence>
    	<attribute name="id" type="ID" use="required"/>
    	<attribute name="orig-id" type="string"/>
    	<attribute name="custom" type="string">
    		<annotation>
    			<documentation>For generic use</documentation>
    		</annotation>
    	</attribute>
    	<attribute name="comments" type="string"/>
    </complexType>

    <complexType name="AlternativeImageType">
    	<attribute name="filename" type="string" use="required"/>
    	<attribute name="comments" type="string"/>
    </complexType>

    <simpleType name="AlignSimpleType">
    	<restriction base="string">
    		<enumeration value="left"/>
    		<enumeration value="centre"/>
    		<enumeration value="right"/>
    		<enumeration value="justify"/>
    	</restriction>
    </simpleType>

	<!-- Newly defined types: -->
	
	<complexType name="TagType">
		<annotation>
			<documentation>
				TEI like tags, i.e. metadata information available to their corresponding element (i.e. in a TextRegion, TextLine or Word)
				like abbreviations, person names, gaps etc. Most tags correspond to a certain text range in their element, which is 
				specified using the index and offset attributes
			</documentation>
		</annotation>		
		
		<sequence minOccurs="0" maxOccurs="unbounded">
			<annotation>
				<documentation>
					Sub properties of this tag. E.g. when specifying a tag "abbrev" for tagging an abbreviation in the text,
					a sub-property could be the property "expansion" for the expansion of the abbreviation.
					Sub property nesting should not exceed child level one to prevent unnecessary complexity of the datastructure.
				</documentation> 
			</annotation>
			<element name="Property" type="pc:PropertyType"></element>
		</sequence>
		
		<attribute name="id" type="ID" use="required">
			<annotation>
				<documentation>
					ID of this tag
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="name"  type="pc:PropertyNameType" use="required">
			<annotation>
				<documentation>
					name of the tag - this could pre specified tags like
					"abbrev", "gap" etc. or custom defined names
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="value"  type="string">
			<annotation>
				<documentation>
					a custom value element for the tag
				</documentation>
			</annotation>
		</attribute>		
		
		<attribute name="index" type="int">
			<annotation>
				<documentation>
					If this tag refers to some text in the corresponding element (i.e. in a TextRegion, TextLine or Word),
					this attribute specifies the 0 based starting index of the referenced text
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="offset" type="int">
			<annotation>
				<documentation>
					If this tag refers to some text in the corresponding element (i.e. in a TextRegion, TextLine or Word),
					this attribute specifies the length of the referenced text
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="continued" type="boolean">
			<annotation>
				<documentation>
					If this tag refers to some text in the corresponding element (i.e. in a TextRegion, TextLine or Word),
					this attribute specifies if it is a continuation from the previous element
				</documentation>
			</annotation>
		</attribute>
	</complexType>

	<complexType name="PropertyType">
		<annotation>
			<documentation>
				A property is a key/value pair storing information about the element it is in.
				Attributes are inherited to their child element and can be ovveridden there. 
				The inheritance hierarchy is: Page -> Region -> TextLine -> Word -> Glyph
			</documentation>
		</annotation>
		
<!--		<sequence minOccurs="0" maxOccurs="unbounded">
			<annotation>
				<documentation>
					Sub properties of this property. E.g. when specifying an attribute "abbrev" for tagging an abbreviation in the text,
					a sub-property could be the property "expansion" for the expansion of the abbreviation.
					Sub property nesting should not exceed child level one to prevent unnecessary complexity of the datastructure.
				</documentation> 
			</annotation>
			<element name="Property" type="pc:PropertyType"></element>
		</sequence>-->
		
		<attribute name="key"  type="pc:PropertyNameType" use="required">
			<annotation>
				<documentation>
					key of the property - this could pre specified keys like
					"lang", "layout", "year_from", "year_to", "style", "weight"
					or meta data from the automatic process
					"editor", "editordate"
					or user defined properties
					"numbering"
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="value"  type="string">
			<annotation>
				<documentation>
					value to the corresponding key:
					for lang: "de", "us", according ISO 639.2 
					for year_(from|to): number
					for style: italic, normal
					for weight: bold, normal
					for layout: float, table, ...
					for numbering: 1,2,...
					for editor: "user name", "htr_process"
					...
				</documentation>
			</annotation>
		</attribute> 
	</complexType>
	
	<simpleType name="PropertyNameType">
		<annotation>
			<documentation>
				Property names should be restricted to alphanumeric characters, underscores, dashes and dots.
			</documentation>
		</annotation>		
		
		<restriction base="string">
			<pattern value="[a-zA-Z0-9_.-]+"/>
		</restriction>
	</simpleType>

	<complexType name="LinkType">
		<attribute name="ref" type="string" use="required">
			<annotation>
				<documentation>
					the link reference
				</documentation>
			</annotation>
		</attribute>
		
		<attribute name="type" type="string">
			<annotation>
				<documentation>
					the link type
				</documentation>
			</annotation>
		</attribute>		
		
		<attribute name="description" type="string">
			<annotation>
				<documentation>
					the link description
				</documentation>
			</annotation>
		</attribute>
	</complexType>
    

</schema>