Initial namespace documentation.

Author: amrc-benmorrow

.gitignore

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+# Vim swap
+*.swp

2023/diagram-editor.md

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+# Diagram editor namespace prefix
+
+This URL prefix, `https://apollo-protocol.github.io/ns/2023/diagram-editor`,
+is allocated for use by the [4D activity diagram editor](https://github.com/Apollo-Protocol/4d-activity-editor).
+
+The URLs under this namespace are used as IRIs in RDF.
+
+## diagram
+
+    https://apollo-protocol.github.io/ns/2023/diagram-editor/diagram#
+
+This prefix is used for objects created in a diagram. The URL fragment
+part is a UUID.
+
+## hqdm-representation
+
+    https://apollo-protocol.github.io/ns/2023/diagram-editor#hqdm-representation
+
+This IRI is included in RDF generated by the editor as the subject of an
+RDF relation with predicate
+[owl:versionInfo](http://www.w3.org/2002/07/owl#versionInfo). It
+indicates the version of the HQDM data representation used.
+

2023/hqdm-lib.md

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+# HQDM-lib namespace prefix
+
+This URL prefix, `https://apollo-protocol.github.io/ns/2023/hqdm-lib`,
+is allocated for use by the [hqdm-lib
+library](https://github.com/Apollo-Protocol/hqdm-lib).
+
+The URLs under this namespace are used as well-known IRIs in RDF.
+
+## rdf-representation
+
+    https://apollo-protocol.github.io/ns/2023/hqdm-lib#rdf-representation
+
+This IRI is included in RDF generated by hqdm-lib as the subject of an
+RDF relation with predicate
+[owl:versionInfo](http://www.w3.org/2002/07/owl#versionInfo). It
+indicates the version of the mapping from HQDM to RDF used.

index.html

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+# The Apollo Protocol
+
+A community to look at unlocking the benefits of digital twins between
+the built environment and manufacturing sectors, supported by the
+technology sector.
+
+[Public information about the Apollo Protocol is available
+here.](https://digitaltwinhub.co.uk/networks/29-the-apollo-protocol/)
+
+This page exists [for technical reasons only](/ns).

index.md

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+# Namespace prefixes
+
+This section of URL space exists to provide namespace prefixes.
+Currently-allocated prefixes are:
+
+* [2023/hqdm-lib](./2023/hqdm-lib) Allocated to
+  [hqdm-lib](https://github.com/Apollo-Protocol/hqdm-lib).
+
+* [2023/diagram-editor](./2023/diagram-editor) Allocated to the
+  prototype [4D activity diagram
+  editor](https://github.com/Apollo-Protocol/4d-activity-editor).