  Linked data portals need to be able to advertise and describe the structure
of their content. A sufficiently expressive and intuitive schema language will
allow portals to communicate these structures. Validation tools will aid in the
publication and maintenance of linked data and increase their quality.
  Two schema language proposals have recently emerged for describing the
structures of RDF graphs: Shape Expressions (ShEx) and Shapes Constraint
Language (SHACL). In this paper we describe how these formalisms can be used in
the development of a linked data portal to describe and validate its contents.
As a use case, we specify a data model inspired by the WebIndex data model, a
medium size linked data portal, using both ShEx and SHACL, and we propose a
benchmark that can generate compliant test data structures of any size. We then
perform some preliminary experiments showing performance of one validation
engine based on ShEx.
