ShEx - Grammar language

ShEx is a grammar language created in 2012.

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Shape Expressions (ShEx) is a language for validating and describing RDF. It was proposed at the 2012 RDF Validation Workshop as a high-level, concise language for RDF validation. The shapes can be defined in a human-friendly compact syntax called ShExC or using any Resource Description Framework (RDF) serialization formats like JSON-LD or Turtle. Read more on Wikipedia...

ShEx Wikipedia page
ShEx first developed in World Wide Web Consortium

Example from the web:

PREFIX :       <http://example.org/>
PREFIX schema: <http://schema.org/>

:Person {
 schema:name  xsd:string   ;
 schema:knows @:Person   * ;
}