The Shapes Constraint Language (SHACL) is "[..] a language for validating RDF graphs against a set of conditions". More precisely, existing RDF can be checked for conformity against a given schema. This service does exactly that.
This service is a pipe module and can therefore be orchestrated in a pipe. The Annotator accepts RDF datasets (including distributions) as a payload. It either augments an existing metrics graph or creates a new one if none has been provided.