Namespace-based Validation Dispatching Language

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Namespace-based Validation Dispatching Language, aka Namespace-based Validation Dispatching Language, is a xml format created in 2006.

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Namespace-based Validation Dispatching Language (NVDL) is an XML schema language for validating XML documents that integrate with multiple namespaces. It is an ISO/IEC standard, and it is Part 4 of the DSDL schema specification. Much of the work on NVDL is based on the older Namespace Routing Language.. Read more on Wikipedia...

Namespace-based Validation Dispatching Language Wikipedia page
Namespace-based Validation Dispatching Language first developed in National Security Complex and Crane Softwrights Ltd

Example from the web:

<rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0">
 <namespace ns="http://www.w3.org/1999/xhtml">
   <validate schema="xhtml.rng"/>
 </namespace>
 <namespace ns="http://www.w3.org/2000/svg/">
   <validate schema="svg.sch"/>
 </namespace>
 <anyNamespace>
   <reject/>
 </anyNamespace>
</rules>