Namespace Routing Language (NRL)
This is not technically a schema language. Its sole purpose is to direct parts of documents to individual schemas based on the namespace of the encountered elements. An NRL is merely a list of XML namespaces and a path to a schema that each corresponds to. This allows each schema to be concerned with only its own language definition, and the NRL file routes the schema validator to the correct schema file based on the namespace of that element.
This XML format is schema-language agnostic and works for just about any schema language.
Read more about this topic: XML Schema Language Comparison
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—Henry David Thoreau (1817–1862)