Property Graph Schemas

rudof has recently added support for PGSchema, a language that is intended to validate Labeled Property Graphs and that has been described in this paper. Rudof supports an extension of PGSchema that includes also property constraints.

Property graphs can be defined with the syntax provided by YARSPG.

An example PGSchema is the following:

CREATE GRAPH TYPE Course {
( personType : Person { name : STRING , OPTIONAL age: INT })
( studentType : Person & Student { name STRING , age INT })
( courseType : Course ) { name STRING })
(: personType OPEN ) -[: knows { since DATE } ]->
(: personType OPEN )
(: studentType ) -[: enrolled { start DATE ,
OPTIONAL end DATE } ] - >(: courseType )
}

rudof pgschema examples/pgs/person.pgs