nxml-mode: Limitations

 
 8 Limitations
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 nXML mode has some limitations:
 
    • DTD support is limited.  Internal parsed general entities declared
      in the internal subset are supported provided they do not contain
      elements.  Other usage of DTDs is ignored.
    • The restrictions on RELAX NG schemas in section 7 of the RELAX NG
      specification are not enforced.