Adds a feature of dimension anotations

.changeset/thick-papayas-turn.md

@@ -0,0 +1,5 @@
+---
+"cube-link": patch
+---
+
+Adding dimension annotations (`meta:annotation`) re https://gitlab.ldbar.ch/bafu/visualize/-/issues/542

meta/core.md

@@ -27,6 +27,32 @@ To be able to distinguish Dimensions that are defined inside a Cube from Dimensi
 
 </aside>
 
+### meta:Limit {#Limit}
+
+A type of [annotation](#annotation) which can be used to express a limit or target value for a dimension.
+
+<aside class='example' title='Dimension with a target'>
+
+```turtle
+<cube/shape> sh:property [
+  a cube:KeyDimension ;  
+  sh:path ex:year ;
+] , [
+  a cube:MeasureDimension ;
+  meta:annotation [
+    a meta:Limit ;
+    meta:limit 95 ;
+    schema:name "Target 2020" ;
+    meta:annotationContext [
+      sh:path ex:year ;
+      sh:hasValue <https://schema.ld.admin.ch/year/2020> ;
+    ] ;
+  ] ;
+] .
+```
+
+</aside>
+
 ## Properties
 
 ### meta:dataKind (temporal / spatial) {#dataKind}
@@ -84,3 +110,57 @@ With `meta:nextInHierarchy` the next lower level is attached to the higher level
 
 This property is used on a Dimension Constraint to express a relation with other properties through a [meta:Relation](#Relation) instance, the nature of this relationship is determined by the properties used on the instance. 
 See [this example](../#relexample).
+
+### meta:annotation {#annotation}
+
+This property is used to add additional information to a dimension.
+
+### meta:annotationContext {#annotationContext}
+
+Links to dimension values to which the annotation applies. The object of `meta:annotationContext` 
+MUST be well-formed Property Shapes. The value of its `sh:path` MUST be na IRI of a cube dimension.
+Only a subset of SHACL Constraints are supported which defined which observations that the annotation
+applies to, namely:
+
+1. `sh:hasValue` - to select specific value(s)
+2. `sh:minInclusive` - to select values greater or equal to a specific value
+3. `sh:maxInclusive` - to select values smaller or equal to a specific value
+4. `sh:minExclusive` - to select values greater than a specific value
+5. `sh:maxExclusive` - to select values smaller than a specific value
+
+<aside class='example' title='Dimension with a continuous limit on a temporal dimension'>
+
+```turtle
+<cube/shape> sh:property [
+  a cube:KeyDimension ;  
+  sh:path ex:year ;
+] , [
+  a cube:MeasureDimension ;
+  meta:annotation [
+    a meta:Limit ;
+    meta:limit 95 ;
+    schema:name "Target 2020" ;
+    meta:annotationContext [
+      sh:property [
+        sh:path ex:year ;
+        sh:minInclusive "2020-01-01"^^xsd:date ;
+        sh:maxInclusive "2020-12-31"^^xsd:date ;
+      ] ;   
+    ] ;
+  ] ;
+] .
+```
+
+</aside>
+
+### meta:limit {#limit}
+
+The value of a [Limit annotation](#Limit).
+
+### meta:upperLimit {#upper-limit}
+
+The upper limit of a [Limit annotation](#Limit).
+
+### meta:lowerLimit {#lower-limit}
+
+The lower limit of a [Limit annotation](#Limit).

validation/standalone-constraint-constraint.ttl

@@ -65,6 +65,10 @@
             sh:path sh:property ;
             sh:node :DimensionRelation ;
         ] ,
+        [
+            sh:path sh:property ;
+            sh:node :Annotation ;
+        ],
         [
             sh:path sh:property ;
             sh:or (
@@ -205,6 +209,47 @@
     ] ;
 .
 
+:Annotation
+    a sh:NodeShape ;
+    sh:property
+        [
+            sh:path rdf:type ;
+            sh:minCount 1 ;
+            sh:message "annotation needs an rdf:type" ;
+        ],
+        [
+            sh:path meta:annotationContext ;
+            sh:maxCount 1 ;
+            sh:nodeKind sh:BlankNode ;
+            sh:message "at most one meta:annotationContext is allowed" ;
+        ],
+        [
+            sh:path
+                (
+                    [ sh:inversePath meta:annotation ]
+                ) ;
+            sh:class cube:MeasureDimension ;
+            sh:message "annotated dimension must be a cube:MeasureDimension" ;
+        ] ;
+.
+
+:AnnotationContext
+    a sh:NodeShape ;
+    sh:targetObjectsOf meta:annotationContext ;
+.
+
+:LimitAnnotation
+    a sh:NodeShape ;
+    sh:targetClass cube:Limit ;
+    sh:property
+        [
+            sh:path meta:limit ;
+            sh:minCount 1 ;
+            sh:or ( [ sh:datatype xsd:integer ] [ sh:datatype xsd:decimal ] ) ;
+            sh:message "at least on meta:limit is needed and it needs to be a number" ;
+        ] ;
+.
+
 :Confidence a sh:NodeShape ;
     sh:targetClass relation:ConfidenceLowerBound, relation:ConfidenceUpperBound ;
     sh:property