Controlling Output Type
A lot of the examples in this chapter have converted XML into HTML, and you might have wondered how an XSLT processor knows to omit the <?xml?> declaration from the beginning of such output documents. It turns out that there's a special rule here: If the document node of the output document is <HTML>, the XSLT processor knows that the output document type is HTML and writes the document accordingly.
In fact, you can specify three types of output documents:
XML. This is the default, and such documents start with an <?xml?> declaration. In addition, entity references will not be replaced with characters such as < or & in the output document; the actual entity reference will appear in the output.
HTML. This is standard ...
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