#103 WIP 5 levels

Author: joepio

src/5-levels-of-data.md

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+# 5 Levels of data usability
+
+Not all data are created equal.
+There are notable differences in how much you can do with data, how flexible it is.
+The more usable data is, the easier it will be to re-use it for developer, researcher or other type of data user.
+
+_This list is inspired by Tim Berners-Lee's [5-star open data](https://5stardata.info/en/)_.
+
+## Level 1: unstructured data
+
+_Examples: images, videos, plain text_
+
+Unstructured data is the least usable.
+Humans can read it, and AI / Machine Learning systems can draw more conclusions from it then ever,
+but it's hard to build an actual application or graphic from only unstructured data.
+
+```
+Hi! I'm Joep, I'm born in 1991.
+```
+
+## Level 2: structured data
+
+_Examples: CSV, XML, JSON, TOML, EXCEL_
+
+Structured data can be read by machines, and this allows us to do all sorts of useful things.
+We can _query_, _sort_ and _filter_.
+But still, this type of data often requires human input when it needs to be processed.
+A human needs to make
+
+
+- Requires human interpretation
+- No semantic definitions of what properties represent
+- Can be readed by machines if mapped correctly
+- Often requires handling invalid data
+
+```json
+{
+  "name": "Joep",
+  "birthYear": ""
+}
+```
+
+## Level 3: type-safe data
+
+_Examples: SQL + DB SCHEMA, JSON + JSON schema, XSD + XML, RDF + SHACL_
+
+Type-safe data means that every value of the data has an explicit datatype, and that these datatypes can be constrained.
+This means that someone re-using this data can know for certain that it conforms to a certain specification, a set of rules.
+The shape of the data is predictable.
+
+
+```json
+{
+  "https://atomicdata.dev/properties/name": "Joep",
+  "https://atomicdata.dev/properties/birthYear": 1991
+}
+```
+
+## Level 4: browsable data
+
+_Examples: Atomic Data_
+
+If your data is _connected_ to other pieces of machine-readable dat, is becomes browsable, similar to how websites link to each other.
+This effectively creates a _web of data_, and allows for a whole new way to think about the internet.
+This is what allows decentralized applications, true data ownership, and a new set of applications.
+
+- Is connected to other pieces of machine verifiable data