support DAG array as option for direct schema reference. Update docs …

…with new descirption options.

_sources/schema.json

@@ -1155,11 +1155,15 @@
     }
   },
   "anyOf": [
+    {
+      "$ref": "#/$defs/Prov"
+    },
     {
       "$ref": "#/$defs/Entity"
     },
     {
       "$ref": "#/$defs/Activity"
     }
+
   ]
 }

bblocks-config.yaml

@@ -1 +1,13 @@
 identifier-prefix: ogc.ogc-utils.prov
+
+name: JSON schema for W3C PROV model
+abstract: Defines a graph structure based on an array of objects implementing PROV defined classes with object cross references
+description: |
+  Provenance defined using the [W3C PROV-O model](https://www.w3.org/TR/prov-o/) is a DAG (non-cyclic graph) based on three main object types: Entity, Activity and Agent.
+  
+  This repository defines a JSON schema and matching JSON-LD context for this model, using the canonical terminology used in the PROV ontology as element names.
+  
+  It also defines a context for an optional schema property "has_provenance" that can be used to wrap a provenance graph as an array of such objects, to extend the prov:wasGeneratedBy (whose range is one or more Entity objects) with an explicit schema.
+  
+  ![](https://www.w3.org/TR/prov-o/diagrams/starting-points.svg)
+