# Namespace Routing Language

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In its simplest form, a **Namespace Routing Language** (NRL) schema consists of a mapping from [namespace](/source/XML_Namespace) [URIs](/source/Uniform_Resource_Identifier) to [schema](/source/XML_schema) URIs. An NRL schema is written in [XML](/source/XML).

[DSDL](/source/Document_Schema_Definition_Languages) Part 4 ([ISO](/source/International_Organization_for_Standardization)/[IEC](/source/International_Electrotechnical_Commission) 19757-4), [NVDL](/source/Namespace-based_Validation_Dispatching_Language) is based on NRL.

## External links

- [NRL home page](https://web.archive.org/web/20170830170619/http://www.thaiopensource.com/relaxng/nrl.html)

- [NVDL information](http://nvdl.org/)

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Adapted from the Wikipedia article [Namespace Routing Language](https://en.wikipedia.org/wiki/Namespace_Routing_Language) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Namespace_Routing_Language?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.