SHACL Shapes Constraint Language is a World Wide Web Consortium specification for validating graph-based data against a set of conditions. Among others, SHACL includes features to express conditions that constrain the number of values that a property may have, the type of such values, numeric ranges, string matching patterns, and logical combinations of such constraints. SHACL also includes an extension mechanism to express more complex conditions in languages such as SPARQL .engine takes as input a data graph and a graph containing shapes declarations and produces a validation report that can be consumed by tools. All these graphs can be represented in any Resource Description Framework serialization formats including JSON-LD or Turtle . The adoption of SHACL may influence the future of linked data .World Wide Web Consortium published the following SHACL Specifications: is the main document , defining the features of SHACL Core and its extension mechanism called SHACL-SPARQL. SHACL Core defines the basic syntax and structure of shapes, constraints, the built-in kinds of constraints, and how to link shapes to data nodes. SHACL-SPARQL defines how to express constraints that are not covered by the built-in constraint kinds. , of which is maintained by the SHACL Community Group defines support for SHACL Rules, a powerful feature for data transformations, inferences and mappings based on data shapes. Also includes extensions of SHACL-SPARQL such as user-defined functions. defines how JavaScript can be used to express constraints, rules, functions and other features. This covers similar ground as SHACL-SPARQL, but using JavaScript as its execution language. .Further Reading and Commercial Tools
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