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Limitations
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.
- Unicode support has problems. This stems mostly from the fact that
the XML (and RELAX NG) character model is based squarely on Unicode,
whereas the Emacs character model is not. Emacs 22 is slated to have
full Unicode support, which should improve the situation here.