neosemantics

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The schema export (via /rdf/<dbname>/onto) seems to lack any DatatypeProperty declarations which are required esp. for reasoning because without any declaration they are assumed to be AnnotationProperties.

As an example consider the following graph:

CREATE (n:Male:Person {name: 'Hans', birthdate: date('1970-10-03'), age: 51,
                       height: 144.3, adult: true, parents: ["Walter", "Sabine"]});

None of the slots appear in the exported schema. However, they are nicely shown with call db.schema.nodeTypeProperties:

╒══════════════════╤═════════════════╤══════════════╤═══════════════╤═══════════╕
│"nodeType"        │"nodeLabels"     │"propertyName"│"propertyTypes"│"mandatory"│
╞══════════════════╪═════════════════╪══════════════╪═══════════════╪═══════════╡
│":`Male`:`Person`"│["Male","Person"]│"birthdate"   │["Date"]       │true       │
├──────────────────┼─────────────────┼──────────────┼───────────────┼───────────┤
│":`Male`:`Person`"│["Male","Person"]│"name"        │["String"]     │true       │
├──────────────────┼─────────────────┼──────────────┼───────────────┼───────────┤
│":`Male`:`Person`"│["Male","Person"]│"adult"       │["Boolean"]    │true       │
├──────────────────┼─────────────────┼──────────────┼───────────────┼───────────┤
│":`Male`:`Person`"│["Male","Person"]│"age"         │["Long"]       │true       │
├──────────────────┼─────────────────┼──────────────┼───────────────┼───────────┤
│":`Male`:`Person`"│["Male","Person"]│"height"      │["Double"]     │true       │
├──────────────────┼─────────────────┼──────────────┼───────────────┼───────────┤
│":`Male`:`Person`"│["Male","Person"]│"parents"     │["StringArray"]│true       │
└──────────────────┴─────────────────┴──────────────┴───────────────┴───────────┘

I vote to add them to the schema export as well as to add the propertyTypes as rdfs:range specification. As an example:

<neo4j://graph.schema#height> a owl:DatatypeProperty;
  rdfs:label "height" ;
  rdfs:range xsd:double .

<neo4j://graph.schema#parents> a owl:DatatypeProperty;
  rdfs:label "parents" ;
  rdfs:range xsd:string .

A solution has to be found for propertyTypes that don't match a corresponding xsd type such as Date.

Furthermore, the node export (/rdf/<dbname>/describe/<id>) should use the respective xsd types.