Add geojsonFeatureFGLenient example

_sources/feature/geojsonFeatureFGLenient/bblock.json

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+{
+  "name": "Custom JSON-FG (lenient) Feature",
+  "abstract": "This example shows a simple customisation method for a JSON-FG (lenient) feature",
+  "status": "under-development",
+  "dateTimeAddition": "2024-07-25T00:00:00Z",
+  "itemClass": "schema",
+  "register": "ogc-building-block-examples",
+  "version": "1.0",
+  "dateOfLastChange": "2023-05-19",
+  "maturity": "development",
+  "scope": "unstable",
+  "tags": [
+    "feature",
+    "examples"
+  ],
+  "group": "Examples",
+  "highlighted": true
+}

_sources/feature/geojsonFeatureFGLenient/description.md

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+## Custom Feature Type
+
+This building block illustrates a typical "Feature Type" - where an object is modelled as a "Feature with geometry",
+but has its own "native schema" - or "domain model". It uses JSON-FG (lenient) as its base.
+
+This is an **interoperable** approach to defining a Feature, allowing re-use of a well-defined domain model.
+
+i.e. the attributes (properties) are managed independently of the packaging container (Feature)
+
+the **propertySet** building block referenced by this container may be used independently of the FeatureModel structure,
+and is where semantic annotations are provided.
+
+This building block **inherits** reusable semantic annotations for the Feature structure from a common library,
+simplifying implementation. 
+
+
+

_sources/feature/geojsonFeatureFGLenient/examples.yaml

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+- title: GeoJSON - specialisation example.
+  comment:
+    This examples shows how to define a customised schema based on an existing building block - in this case the OGC API Features basic GeoJSON Feature response
+
+  base-uri: http://example.com/features/
+  snippets:
+    - language: json
+      ref: examples/feature.json

_sources/feature/geojsonFeatureFGLenient/examples/feature.json

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+{
+  "id": "f1",
+  "type": "Feature",
+  "geometry": {
+    "type": "LineString",
+    "coordinates": [
+      [
+        -111.67183507997295,
+        40.056709946862874
+      ],
+      [
+        -111.71,
+        40.156709946862874
+      ]
+    ]
+  },
+  "properties": {
+    "myProp": "Mandatory property example"
+  }
+}

_sources/feature/geojsonFeatureFGLenient/schema.yaml

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+"$schema": https://json-schema.org/draft/2020-12/schema
+description: 'Example of a sinmple GeoJSON Feature specialisation'
+allOf:
+  - $ref: bblocks://ogc.geo.json-fg.feature-lenient
+  - properties:
+      properties:
+        $ref: ../propertySet/schema.yaml

_sources/feature/geojsonFeatureFGLenient/transforms/sample.jq

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+.properties.myPropUpper = .properties.myProp | ascii_upcase

_sources/feature/geojsonFeatureFGLenient/transforms/sample.shacl

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+@prefix mymodel: <http://example.org/myModel/> .
+@prefix sh: <http://www.w3.org/ns/shacl#>.
+
+<urn:example:LabelToDCTERMS>
+    a sh:NodeShape ;
+    sh:targetSubjectsOf mymodel:myProp;
+    sh:rule [
+        a sh:SPARQLRule ;
+        sh:construct """
+            prefix dcterms: <http://purl.org/dc/terms/>
+            prefix mymodel: <http://example.org/myModel/>
+            CONSTRUCT {
+                $this dcterms:identifier ?myPropUpper
+            } WHERE {
+                $this mymodel:myProp ?myProp
+                BIND(UCASE(?myProp) as ?myPropUpper)
+            }
+        """
+    ] ;
+.