https://www.php.net/manual/zh/domdocument.xinclude.php
PHP: DOMDocument::xinclude - Manual
Substitutes XIncludes in a DOMDocument Object
phpdomdocumentxincludemanual
https://www.php.net/manual/en/domdocument.xinclude.php
PHP: DOMDocument::xinclude - Manual
Substitutes XIncludes in a DOMDocument Object
phpdomdocumentxincludemanual
https://www.nist.gov/publications/xinclude-test-suite-version-2-xml-core-working-group
XInclude Test Suite Version 2, XML Core Working Group | NIST
Feb 17, 2017 - The goal of this document is to help W3C editors write better specifications, by making a specification easier to interpret without ambiguity and clearer as to
test suiteworking groupxincludeversion2
https://www.w3.org/news/2004/xinclude-is-a-w3c-recommendation/
XInclude Is a W3C Recommendation | 2004 | News | W3C
The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web...
is aw3c recommendationxinclude2004news