ANSI/NISO Z39.96-2015

10 Article Authoring Tag Set, version 1.1 • 10.5 Attributes

10.5.121 @xmlns:xsi XML Schema Namespace Declaration

This is not an attribute, but a namespace pseudo-attribute. The value provides a prefix to use for the @xsi_schemaLocation attribute an included vocabulary requires. All namespace prefixes must be associated with a URL, and the prefix xsi has been set to the URL for the World Wide Web Consortium (W3C) XML Schema.

In element <article>, this attribute must have the value (as given below).
Value Meaning The prefix xsi has been set to the URL of the W3C XML Schema.