!!! Overview
[{$pagename}] ([XSD]) which offers facilities for describing the structure and constraining the contents of [XML] documents, including those which exploit the [XML namespace] facility. 

The [XML schema] language, which is itself represented in an [XML] vocabulary and uses namespaces, substantially reconstructs and considerably extends the capabilities found in [XML] [Document type definition]s ([DTD]s). 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
----
* [#1] - [W3C XML Schema Definition Language (XSD) 1.1|https://www.w3.org/TR/xmlschema11-1/|target='_blank'] - based on information obtained 2018-01-08-