Namespace Routing Language is an actively used xml format created in 2003.

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Example code from the web:

<rules xmlns="http://www.thaiopensource.com/validate/nrl">
 <namespace ns="http://schemas.xmlsoap.org/soap/envelope/">
   <validate schema="soap-envelope.xsd"/>
 </namespace>
 <namespace ns="http://www.w3.org/1999/xhtml">
   <validate schema="xhtml.rng"/>
   <validate schema="xhtml.sch"/>
 </namespace>
</rules>

Last updated August 9th, 2020

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