Added definition of Basic type

Signed-off-by: Tomas Kraus <[email protected]>

spec/src/main/asciidoc/ch02-entities.adoc

@@ -1110,6 +1110,14 @@ public class MedicalHistory {
 }
 ----
 
+=== Basic Type
+
+Basic type is any Java primitive type, wrapper of the primitive types, java.lang.String,
+java.math.BigInteger, java.math.BigDecimal, java.util.Date, java.util.Calendar, java.sql.Date,
+java.sql.Time, java.sql.Timestamp, java.time.LocalDate, java.time.LocalTime,
+java.time.LocalDateTime, java.time.OffsetTime, java.time.OffsetDateTime, byte[], Byte[], char[],
+Character[], enum, any other type that implements Serializable.
+
 === Embeddable Classes [[a487]]
 
 An entity may use other fine-grained classes
@@ -2336,4 +2344,4 @@ identifiers and for which the above rules apply:
 * stored-procedure-parameter(name *attribute*)
 * table(name, catalog, schema *attributes*)
 * table-generator(table, catalog, schema, pk-column-name, value-column-name *attributes*)
-* unique-constraint(name *attribute*, column-name *element*)
+* unique-constraint(name *attribute*, column-name *element*)