[1] Guide to the W3C XML Specification (XMLspec) DTD, Version 2.1, , https://www.w3.org/XML/1998/06/xmlspec-report.htm#AEN1529
[7] Guide to the W3C XML Specification (XMLspec) DTD, Version 2.1, , https://www.w3.org/XML/1998/06/xmlspec-report.htm#AEN3040
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