From d961d96497ccf62de31e327509f1e7637d2fc3f3 Mon Sep 17 00:00:00 2001
From: Pano Maria <pano.maria@gmail.com>
Date: Wed, 21 Feb 2024 06:52:36 +0100
Subject: [PATCH] update test cases and shapes (#13)

---
 ontology/documentation/ontology.ttl |   2 +-
 shapes/lv.ttl                       |  63 ++++++++++++++--
 spec/section/joins.md               |   9 +++
 test-cases/RMLLVTC0001/mapping.ttl  |  17 +++--
 test-cases/RMLLVTC0001/output.nq    |   2 +
 test-cases/RMLLVTC0002/mapping.ttl  |   8 +-
 test-cases/RMLLVTC0003/mapping.ttl  |  60 +++++++++++++--
 test-cases/RMLLVTC0003/output.nq    |  15 ++++
 test-cases/RMLLVTC0004/mapping.ttl  | 110 ++++++++++++++++++++++++++++
 test-cases/RMLLVTC0004/output.nq    |  13 ++++
 test-cases/RMLLVTC0004/people.csv   |   4 +
 test-cases/RMLLVTC0004/people.json  |  26 +++++++
 test-cases/RMLLVTC0005/mapping.ttl  | 110 ++++++++++++++++++++++++++++
 test-cases/RMLLVTC0005/output.nq    |  13 ++++
 test-cases/RMLLVTC0005/people.csv   |   4 +
 test-cases/RMLLVTC0005/people.json  |  26 +++++++
 16 files changed, 459 insertions(+), 23 deletions(-)
 create mode 100644 test-cases/RMLLVTC0001/output.nq
 create mode 100644 test-cases/RMLLVTC0003/output.nq
 create mode 100644 test-cases/RMLLVTC0004/mapping.ttl
 create mode 100644 test-cases/RMLLVTC0004/output.nq
 create mode 100644 test-cases/RMLLVTC0004/people.csv
 create mode 100644 test-cases/RMLLVTC0004/people.json
 create mode 100644 test-cases/RMLLVTC0005/mapping.ttl
 create mode 100644 test-cases/RMLLVTC0005/output.nq
 create mode 100644 test-cases/RMLLVTC0005/people.csv
 create mode 100644 test-cases/RMLLVTC0005/people.json

diff --git a/ontology/documentation/ontology.ttl b/ontology/documentation/ontology.ttl
index 1739a44..5cf5bf1 100644
--- a/ontology/documentation/ontology.ttl
+++ b/ontology/documentation/ontology.ttl
@@ -6,7 +6,7 @@
 
 
 <http://w3id.org/rml/lv/> a owl:Ontology ;
-    # TODO check https://github.com/kg-construct/rml-core/issues/73 for resolution
+    #  check https://github.com/kg-construct/rml-core/issues/73 for resolution
     # owl:imports <http://w3id.org/rml/core> ; # TODO not dereferencable?
     owl:imports <https://raw.githubusercontent.com/kg-construct/rml-core/main/ontology/rml-core.owl> ;
     # owl:imports <http://w3id.org/rml/io/> ; # TODO not dereferencable?
diff --git a/shapes/lv.ttl b/shapes/lv.ttl
index f1bbb19..1a0e42c 100644
--- a/shapes/lv.ttl
+++ b/shapes/lv.ttl
@@ -13,19 +13,21 @@
 rmlsh:LogicalViewShape a sh:NodeShape ;
     sh:name "LogicalView" ;
     sh:description """
-    A logical view is ...
+    A logical view (rml:LogicalView) is a type of logical source that is derived from another logical source by defining field with data from said logical source.
     """ ;
     sh:message """
-    Logical view requires ...
+    rml:LogicalView requires requires
+    - exactly one rml:source property, with a rml:LogicalSource as its value.
+    - at least one rml:field property, with a rml:Field as its value.
     """ ;
     sh:targetClass rml:LogicalView ;
     sh:targetObjectsOf rml:parentLogicalView ;
     sh:property [
         sh:description """
-        TODO describe here and in spec
+        The source of the logical view. This is the logical source from which the logical view is derived.
         """ ;
         sh:message """
-        Exactly one rml:onLogicalSource property must be present, with a rml:LogicalSource as its value.
+        Exactly one rml:source property must be specified for a rml:LogicalView, with a rml:LogicalSource as its value.
         """ ;
         sh:path rml:source ;
         sh:minCount 1 ;
@@ -33,11 +35,32 @@ rmlsh:LogicalViewShape a sh:NodeShape ;
         sh:node rmlsh:LogicalSource ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] , [
+        sh:description """
+        A field of the logical view.
+        """ ;
+        sh:message """
+        At least one rml:field property must be specified for a rml:LogicalView, with a resource as its value.
+        """ ;
         sh:path rml:field ;
         sh:minCount 1 ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] , [
-        sh:path [ sh:alternativePath ( rml:leftJoin rml:innerJoin ) ] ;
+        sh:description """
+        A left join of the logical view.
+        """ ;
+        sh:message """
+        The value of a rml:leftJoin property for a rml:LogicalView must be a resource.
+        """ ;
+        sh:path rml:leftJoin ;
+        sh:nodeKind sh:BlankNodeOrIRI ;
+    ] , [
+        sh:description """
+        An inner join of the logical view.
+        """ ;
+        sh:message """
+        The value of a rml:innerJoin property for a rml:LogicalView must be a resource.
+        """ ;
+        sh:path rml:innerJoin ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] .
 
@@ -53,12 +76,24 @@ rmlsh:FieldShape a sh:NodeShape ;
     sh:targetClass rml:Field ;
     sh:targetObjectOf rml:field ;
     sh:property [
+        sh:description """
+        The name of the field.
+        """ ;
+        sh:message """
+        Exactly one rml:fieldName property must be specified for a rml:Field, with a string as its value.
+        """ ;
         sh:path rml:fieldName ;
         sh:minCount 1 ;
         sh:maxCount 1 ;
         sh:datatype xsd:string ;
         sh:nodeKind sh:Literal ;
     ] , [
+        sh:description """
+        A child field of the field.
+        """ ;
+        sh:message """
+        The value of a rml:field property for a rml:Field must be a resource.
+        """ ;
         sh:path rml:field ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] .
@@ -75,15 +110,33 @@ rmlsh:LogicalViewJoinShape a sh:NodeShape ;
     sh:targetClass rml:LogicalViewJoin ;
     sh:targetObjectOf rml:leftJoin , rml:innerJoin ;
     sh:property [
+        sh:description """
+        The parent logical view of the logical view join.
+        """ ;
+        sh:message """
+        Exactly one rml:parentLogicalView property must be specified for a rml:LogicalViewJoin, with a resource as its value.
+        """ ;
         sh:path rml:parentLogicalView ;
         sh:minCount 1 ;
         sh:maxCount 1 ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] , [
+        sh:description """
+        A join condition of the logical view join.
+        """ ;
+        sh:message """
+        At least one rml:parentLogicalView property must be specified for a rml:LogicalViewJoin, with a resource as its value.
+        """ ;
         sh:path rml:joinCondition ;
         sh:minCount 1 ;
         sh:nodeKind sh:BlankNodeOrIRI ;
     ] , [
+        sh:description """
+        A join condition of the logical view join.
+        """ ;
+        sh:message """
+        At least one rml:field property must be specified for a rml:LogicalViewJoin, with a resource as its value.
+        """ ;
         sh:path rml:field ;
         sh:minCount 1 ;
         sh:nodeKind sh:BlankNodeOrIRI ;
diff --git a/spec/section/joins.md b/spec/section/joins.md
index a06362a..3814ad8 100644
--- a/spec/section/joins.md
+++ b/spec/section/joins.md
@@ -77,6 +77,10 @@ The logical iterations from the child logical view are extended with values from
 When more than one logical iteration in the parent logical view matches with a logical iteration in the child logical view, each match leads to an additional extended logical iteration.
 If no match is found for a logical iteration, the logical iteration is removed from the child logical view.
 
+<aside class="issue">
+Pano: If there are more than one join, what is the order of execution?
+</aside>
+
 ### Join examples
 <aside class="issue">
 Pano please verify what I did with the iterator and # key from the parent logical view. Is this ok? This should still be described somewhere?
@@ -201,6 +205,11 @@ If an inner joins would have been used, the logical view would have only 3 logic
 </aside>
 </aside>
 
+<aside class="issue">
+We cannot just use the term `parent.#` as a field, since there may be multiple parents and `parent` could also be a declared field.
+Do we need this as a field at all?
+</aside>
+
 ### Inner join
 <aside class=example id=ex-innerjoin>
 
diff --git a/test-cases/RMLLVTC0001/mapping.ttl b/test-cases/RMLLVTC0001/mapping.ttl
index 437f567..3d80815 100644
--- a/test-cases/RMLLVTC0001/mapping.ttl
+++ b/test-cases/RMLLVTC0001/mapping.ttl
@@ -1,10 +1,11 @@
 @prefix rml: <http://w3id.org/rml/> .
 @prefix : <http://example.org/> .
 
-@base <http://example.com/base/> .
-
 :jsonSource a rml:LogicalSource ;
   rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.json" ;
   ] ;
   rml:referenceFormulation rml:JSONPath ;
   rml:iterator "$.people[*]" .
@@ -16,11 +17,15 @@
     rml:reference "$.name" ;
   ] .
 
-# TODO
-<#TriplesMap> a rml:TriplesMap ;
+:triplesMapPerson a rml:TriplesMap ;
   rml:logicalSource :jsonView ;
   rml:subjectMap [
-    rml:constant :sub ;
-    rml:class :Any ;
+    rml:template "https://example.org/people/{name}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasName ;
+    rml:objectMap [
+      rml:reference "name" ;
+    ] ;
   ] .
 
diff --git a/test-cases/RMLLVTC0001/output.nq b/test-cases/RMLLVTC0001/output.nq
new file mode 100644
index 0000000..d0a2cfb
--- /dev/null
+++ b/test-cases/RMLLVTC0001/output.nq
@@ -0,0 +1,2 @@
+<http://example.org/people/alice> <http://example.org/hasName> "alice" .
+<http://example.org/people/bob> <http://example.org/hasName> "bob" .
diff --git a/test-cases/RMLLVTC0002/mapping.ttl b/test-cases/RMLLVTC0002/mapping.ttl
index 3058af9..77bdb25 100644
--- a/test-cases/RMLLVTC0002/mapping.ttl
+++ b/test-cases/RMLLVTC0002/mapping.ttl
@@ -1,10 +1,12 @@
 @prefix rml: <http://w3id.org/rml/> .
 @prefix : <http://example.org/> .
 
-@base <http://example.com/base/> .
-
 :jsonSource a rml:LogicalSource ;
-  rml:source [] ; # TODO
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.json" ;
+  ] ;
   rml:referenceFormulation rml:JSONPath ;
   rml:iterator "$.people[*]" .
 
diff --git a/test-cases/RMLLVTC0003/mapping.ttl b/test-cases/RMLLVTC0003/mapping.ttl
index 027d3d0..4ce75f4 100644
--- a/test-cases/RMLLVTC0003/mapping.ttl
+++ b/test-cases/RMLLVTC0003/mapping.ttl
@@ -1,10 +1,13 @@
 @prefix rml: <http://w3id.org/rml/> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix : <http://example.org/> .
 
-@base <http://example.com/base/> .
-
 :jsonSource a rml:LogicalSource ;
-  rml:source [] ; # TODO
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.json" ;
+  ] ;
   rml:referenceFormulation rml:JSONPath ;
   rml:iterator "$.people[*]" .
 
@@ -28,7 +31,11 @@
   ] .
 
 :csvSource a rml:LogicalSource ;
-  rml:source [] ; # TODO
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.csv" ;
+  ] ;
   rml:referenceFormulation rml:CSV .
 
 :csvView a rml:LogicalView ;
@@ -57,10 +64,47 @@
     ] ;
   ] .
 
-# TODO
-<#TriplesMap> a rml:TriplesMap ;
+
+:triplesMapPerson a rml:TriplesMap ;
+  rml:logicalSource :csvView ;
+  rml:subjectMap [
+    rml:template "http://example.org/person/{name}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasName ;
+    rml:objectMap [
+      rml:reference "name" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasBirthyear ;
+    rml:objectMap [
+      rml:reference "birthyear" ;
+      rml:datatype xsd:gYear ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasItem ;
+    rml:objectMap [
+      rml:parentTriplesMap :triplesMapItem ;
+    ] ;
+  ] .
+
+:triplesMapItem a rml:TriplesMap ;
   rml:logicalSource :csvView ;
   rml:subjectMap [
-    rml:constant :sub ;
-    rml:class :Any ;
+    rml:template "http://example.org/person/{name}/item/{item_type}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasType ;
+    rml:objectMap [
+      rml:reference "item_type" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasWeight ;
+    rml:objectMap [
+      rml:reference "item_weight" ;
+      rml:datatype xsd:integer ;
+    ] ;
   ] .
diff --git a/test-cases/RMLLVTC0003/output.nq b/test-cases/RMLLVTC0003/output.nq
new file mode 100644
index 0000000..b5c2e86
--- /dev/null
+++ b/test-cases/RMLLVTC0003/output.nq
@@ -0,0 +1,15 @@
+<http://example.org/people/alice> <http://example.org/hasName> "alice" .
+<http://example.org/people/alice> <http://example.org/hasBirthyear> "1995"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/alice> <http://example.org/hasItem> <http://example.org/people/alice/item/sword> .
+<http://example.org/people/alice> <http://example.org/hasItem> <http://example.org/people/alice/item/shield> .
+<http://example.org/people/alice/item/sword> <http://example.org/hasType> "sword" .
+<http://example.org/people/alice/item/sword> <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/alice/item/shield> <http://example.org/hasType> "shield" .
+<http://example.org/people/alice/item/shield> <http://example.org/hasWeight> "2500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/bob> <http://example.org/hasName> "bob" .
+<http://example.org/people/bob> <http://example.org/hasBirthyear> "1999"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/bob> <http://example.org/hasItem> <http://example.org/people/alice/item/flower> .
+<http://example.org/people/alice/item/flower> <http://example.org/hasType> "flower" .
+<http://example.org/people/alice/item/flower> <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/tobias> <http://example.org/hasName> "tobias" .
+<http://example.org/people/tobias> <http://example.org/hasBirthyear> "2005"^^<http://www.w3.org/2001/XMLSchema#gYear> .
diff --git a/test-cases/RMLLVTC0004/mapping.ttl b/test-cases/RMLLVTC0004/mapping.ttl
new file mode 100644
index 0000000..f08e3b3
--- /dev/null
+++ b/test-cases/RMLLVTC0004/mapping.ttl
@@ -0,0 +1,110 @@
+@prefix rml: <http://w3id.org/rml/> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix : <http://example.org/> .
+
+:jsonSource a rml:LogicalSource ;
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.json" ;
+  ] ;
+  rml:referenceFormulation rml:JSONPath ;
+  rml:iterator "$.people[*]" .
+
+:jsonView a rml:LogicalView ;
+  rml:source :jsonSource ;
+  rml:field [
+    rml:fieldName "name" ;
+    rml:reference "$.name" ;
+  ] ;
+  rml:field [
+    rml:fieldName "item" ;
+    rml:reference "$.items[*]" ;
+    rml:field [
+      rml:fieldName "type" ;
+      rml:reference "$.type" ;
+    ] ;
+    rml:field [
+      rml:fieldName "weight" ;
+      rml:reference "$.weight" ;
+    ] ;
+  ] .
+
+:csvSource a rml:LogicalSource ;
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.csv" ;
+  ] ;
+  rml:referenceFormulation rml:CSV .
+
+:csvView a rml:LogicalView ;
+  rml:source :csvSource ;
+  rml:field [
+    rml:fieldName "name" ;
+    rml:reference "name" ;
+  ] ;
+  rml:field [
+    rml:fieldName "birthyear" ;
+    rml:reference "birthyear" ;
+  ] ;
+  rml:innerJoin [
+    rml:parentLogicalView :jsonView ;
+    rml:joinCondition [
+      rml:parent "name" ;
+      rml:child "name" ;
+    ] ;
+    rml:field [
+      rml:fieldName "item_type" ;
+      rml:reference "item.type" ;
+    ] ;
+    rml:field [
+      rml:fieldName "item_weight" ;
+      rml:reference "item.weight" ;
+    ] ;
+  ] .
+
+
+:triplesMapPerson a rml:TriplesMap ;
+  rml:logicalSource :csvView ;
+  rml:subjectMap [
+    rml:template "http://example.org/person/{name}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasName ;
+    rml:objectMap [
+      rml:reference "name" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasBirthyear ;
+    rml:objectMap [
+      rml:reference "birthyear" ;
+      rml:datatype xsd:gYear ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasItem ;
+    rml:objectMap [
+      rml:parentTriplesMap :triplesMapItem ;
+    ] ;
+  ] .
+
+:triplesMapItem a rml:TriplesMap ;
+  rml:logicalSource :csvView ;
+  rml:subjectMap [
+    rml:template "http://example.org/person/{name}/item/{item_type}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasType ;
+    rml:objectMap [
+      rml:reference "item_type" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasWeight ;
+    rml:objectMap [
+      rml:reference "item_weight" ;
+      rml:datatype xsd:integer ;
+    ] ;
+  ] .
diff --git a/test-cases/RMLLVTC0004/output.nq b/test-cases/RMLLVTC0004/output.nq
new file mode 100644
index 0000000..99ee8d3
--- /dev/null
+++ b/test-cases/RMLLVTC0004/output.nq
@@ -0,0 +1,13 @@
+<http://example.org/people/alice> <http://example.org/hasName> "alice" .
+<http://example.org/people/alice> <http://example.org/hasBirthyear> "1995"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/alice> <http://example.org/hasItem> <http://example.org/people/alice/item/sword> .
+<http://example.org/people/alice> <http://example.org/hasItem> <http://example.org/people/alice/item/shield> .
+<http://example.org/people/alice/item/sword> <http://example.org/hasType> "sword" .
+<http://example.org/people/alice/item/sword> <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/alice/item/shield> <http://example.org/hasType> "shield" .
+<http://example.org/people/alice/item/shield> <http://example.org/hasWeight> "2500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/bob> <http://example.org/hasName> "bob" .
+<http://example.org/people/bob> <http://example.org/hasBirthyear> "1999"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/bob> <http://example.org/hasItem> <http://example.org/people/alice/item/flower> .
+<http://example.org/people/alice/item/flower> <http://example.org/hasType> "flower" .
+<http://example.org/people/alice/item/flower> <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
diff --git a/test-cases/RMLLVTC0004/people.csv b/test-cases/RMLLVTC0004/people.csv
new file mode 100644
index 0000000..edc942d
--- /dev/null
+++ b/test-cases/RMLLVTC0004/people.csv
@@ -0,0 +1,4 @@
+name,birthyear
+alice,1995
+bob,1999
+tobias,2005
diff --git a/test-cases/RMLLVTC0004/people.json b/test-cases/RMLLVTC0004/people.json
new file mode 100644
index 0000000..87d5629
--- /dev/null
+++ b/test-cases/RMLLVTC0004/people.json
@@ -0,0 +1,26 @@
+{
+  "people": [
+    {
+      "name": "alice",
+      "items": [
+        {
+          "type": "sword",
+          "weight": 1500
+        },
+        {
+          "type": "shield",
+          "weight": 2500
+        }
+      ]
+    },
+    {
+      "name": "bob",
+      "items": [
+        {
+          "type": "flower",
+          "weight": 15
+        }
+      ]
+    }
+  ]
+}
diff --git a/test-cases/RMLLVTC0005/mapping.ttl b/test-cases/RMLLVTC0005/mapping.ttl
new file mode 100644
index 0000000..c2bc301
--- /dev/null
+++ b/test-cases/RMLLVTC0005/mapping.ttl
@@ -0,0 +1,110 @@
+@prefix rml: <http://w3id.org/rml/> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix : <http://example.org/> .
+
+:jsonSource a rml:LogicalSource ;
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.json" ;
+  ] ;
+  rml:referenceFormulation rml:JSONPath ;
+  rml:iterator "$.people[*]" .
+
+:jsonView a rml:LogicalView ;
+  rml:source :jsonSource ;
+  rml:field [
+    rml:fieldName "name" ;
+    rml:reference "$.name" ;
+  ] ;
+  rml:field [
+    rml:fieldName "item" ;
+    rml:reference "$.items[*]" ;
+    rml:field [
+      rml:fieldName "type" ;
+      rml:reference "$.type" ;
+    ] ;
+    rml:field [
+      rml:fieldName "weight" ;
+      rml:reference "$.weight" ;
+    ] ;
+  ] .
+
+:csvSource a rml:LogicalSource ;
+  rml:source [
+    a rml:RelativePathSource , rml:Source ;
+    rml:root rml:MappingDirectory ;
+    rml:path "people.csv" ;
+  ] ;
+  rml:referenceFormulation rml:CSV .
+
+:csvView a rml:LogicalView ;
+  rml:source :csvSource ;
+  rml:field [
+    rml:fieldName "name" ;
+    rml:reference "name" ;
+  ] ;
+  rml:field [
+    rml:fieldName "birthyear" ;
+    rml:reference "birthyear" ;
+  ] ;
+  rml:innerJoin [
+    rml:parentLogicalView :jsonView ;
+    rml:joinCondition [
+      rml:parent "name" ;
+      rml:child "name" ;
+    ] ;
+    rml:field [
+      rml:fieldName "item_type" ;
+      rml:reference "item.type" ;
+    ] ;
+    rml:field [
+      rml:fieldName "item_weight" ;
+      rml:reference "item.weight" ;
+    ] ;
+  ] .
+
+:triplesMapPerson a rml:TriplesMap ;
+  rml:logicalSource :csvView ;
+  rml:subjectMap [
+    rml:template "http://example.org/person/{name}" ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasName ;
+    rml:objectMap [
+      rml:reference "name" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasBirthyear ;
+    rml:objectMap [
+      rml:reference "birthyear" ;
+      rml:datatype xsd:gYear ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasItem ;
+    rml:objectMap [
+      rml:parentTriplesMap :triplesMapItem ;
+    ] ;
+  ] .
+
+:triplesMapItem a rml:TriplesMap ;
+  rml:logicalSource :csvView ;
+  rml:subjectMap [
+    rml:template "item_{#}_{item_type.#}" ;
+    rml:termType rml:BlankNode ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasType ;
+    rml:objectMap [
+      rml:reference "item_type" ;
+    ] ;
+  ] ;
+  rml:predicateObjectMap [
+    rml:predicate :hasWeight ;
+    rml:objectMap [
+      rml:reference "item_weight" ;
+      rml:datatype xsd:integer ;
+    ] ;
+  ] .
diff --git a/test-cases/RMLLVTC0005/output.nq b/test-cases/RMLLVTC0005/output.nq
new file mode 100644
index 0000000..dde7d35
--- /dev/null
+++ b/test-cases/RMLLVTC0005/output.nq
@@ -0,0 +1,13 @@
+<http://example.org/people/alice> <http://example.org/hasName> "alice" .
+<http://example.org/people/alice> <http://example.org/hasBirthyear> "1995"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/alice> <http://example.org/hasItem> _:item_0_0 .
+<http://example.org/people/alice> <http://example.org/hasItem> _:item_0_1 .
+_:item_0_0 <http://example.org/hasType> "sword" .
+_:item_0_0 <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+_:item_0_1 <http://example.org/hasType> "shield" .
+_:item_0_1 <http://example.org/hasWeight> "2500"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.org/people/bob> <http://example.org/hasName> "bob" .
+<http://example.org/people/bob> <http://example.org/hasBirthyear> "1999"^^<http://www.w3.org/2001/XMLSchema#gYear> .
+<http://example.org/people/bob> <http://example.org/hasItem> _:item_1_2 .
+_:item_1_2 <http://example.org/hasType> "flower" .
+_:item_1_2 <http://example.org/hasWeight> "1500"^^<http://www.w3.org/2001/XMLSchema#integer> .
diff --git a/test-cases/RMLLVTC0005/people.csv b/test-cases/RMLLVTC0005/people.csv
new file mode 100644
index 0000000..edc942d
--- /dev/null
+++ b/test-cases/RMLLVTC0005/people.csv
@@ -0,0 +1,4 @@
+name,birthyear
+alice,1995
+bob,1999
+tobias,2005
diff --git a/test-cases/RMLLVTC0005/people.json b/test-cases/RMLLVTC0005/people.json
new file mode 100644
index 0000000..87d5629
--- /dev/null
+++ b/test-cases/RMLLVTC0005/people.json
@@ -0,0 +1,26 @@
+{
+  "people": [
+    {
+      "name": "alice",
+      "items": [
+        {
+          "type": "sword",
+          "weight": 1500
+        },
+        {
+          "type": "shield",
+          "weight": 2500
+        }
+      ]
+    },
+    {
+      "name": "bob",
+      "items": [
+        {
+          "type": "flower",
+          "weight": 15
+        }
+      ]
+    }
+  ]
+}