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Document type definition support

A DTD is required in an external XSLT stylesheet that uses entity references other than the predefined XML entity references. Using non-predefined entity references commonly occurs when the XSLT stylesheet is generated by tools for generating transformations from XML to HTML or XHTML, that is, to generate a page to be displayed by a browser. Often the tool will not add the DTD. A DTD that defines the entities must be added after the XSLT stylesheet is generated and before it is used by XML Extensions. Here is an example of such a DTD for XHTML entities:
<!DOCTYPE root [
 <!ENTITY % HTMLlat1 PUBLIC
 "-//W3C//ENTITIES Latin 1 for XHTML//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent">
%HTMLlat1;
 <!ENTITY % HTMLsymbol PUBLIC
 "-//W3C//ENTITIES Symbols for XHTML//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml-symbol.ent">
%HTMLsymbol;
 <!ENTITY % HTMLspecial PUBLIC
 "-//W3C//ENTITIES Special for XHTML//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml-special.ent">
%HTMLspecial;]>
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