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:Tree Regular Expressions for XML (TREX) is a schema language for [[XML]].<ref name="Jones2002">{{cite book |last1=Jones |first1=Christopher A. |last2=Drake |first2=Fred L. |last3=Jr |first3=Fred L. Drake |title=Python and XML |date=2002 |publisher="O'Reilly Media, Inc." |isbn=9780596001285 |page=21 |url=https://books.google.com/books?id=bPfQnxnw_NMC&pg=PA21&lpg=PA21&dq=%22TREX%22+xml+-wikipedia&source=bl&ots=C5troKOC1f&sig=ACfU3U1yolkJi-TYSrKgxdAPN90SoFWf8w&hl=en&sa=X&ved=2ahUKEwjD3qj3n-3gAhWEKn0KHWLJA4wQ6AEwCXoECAQQAQ#v=onepage&q=%22TREX%22%20xml%20-wikipedia&f=false |accessdate=6 March 2019 |language=en}}</ref> TREX has been merged with [[Regular Language description for XML|RELAX]] to create [[RELAX NG]].<ref name="Jones2002" /><ref name="Cover2001">{{cite web |last1=Cover |first1=Robin |title=Tree Regular Expressions for XML (TREX) |url=http://xml.coverpages.org/trex.html |website=xml.coverpages.org |accessdate=6 March 2019}}</ref>
;[[RELAX NG]]
:An XML Schema language, with both an explicit XML syntax and a compact syntax. Clark was highly critical of the [[W3C Schema]] language (now known as XSD)<ref name="schema-wars">{{cite web|title=Schema Wars: XML Schema vs. RELAX NG|url=http://webreference.com/xml/column59/index-2.html|accessdate=11 May 2019}}</ref> and developed RELAX NS in response
;[http://www.thaiopensource.com/relaxng/jing.html Jing]
:An implementation of RELAX NG.
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