RDF datatypes

In RDF, the datatype of a literal can optionally be specified with a datatype URI. If a constraint type of Datatype is provided, csv2shex normalizes statement elements as follows:

• Csv2shex checks that the value provided for ‘constraint_value’ is a URI or prefixed URI (as it must be, according to the rules of RDF). If it is not, the constraint value is set to None.
• Where no value type is provided, csv2shex assigns the value Literal.
• If a constraint type of Datatype is specified for anything other than a value of type Literal (which does not make sense in terms of RDF), csv2shex will leave it to the user to spot and correct this error.

propertyID	value_type	constraint_value	constraint_type	annot
:color		xsd:string	Datatype
:color		string	Datatype	Incorrect!

This is interpreted as:

DCAP
    Shape
        shapeID: @default
        start: True
        Statement
            propertyID: :color
            value_type: Literal
            constraint_value: xsd:string
            constraint_type: Datatype
        Statement
            propertyID: :color
            value_type: Literal
            constraint_value: None
            constraint_type: Datatype