XSLT Media Types
The element can optionally take the attribute media-type, which allows one to set the media type (or MIME type) for the resulting output, for example: text/xml and application/xml since for a long time there was no registered media type for XSLT. During this time text/xsl became the de facto standard. In XSLT 1.0 it was not specified how the media-type values should be used.
With the release of the XSLT 2.0, the W3C recommended the registration of the MIME media type application/xslt+xml and it was later registered with the Internet Assigned Numbers Authority
Pre-1.0 working drafts of XSLT used text/xsl in their embedding examples, and this type was implemented and continues to be promoted by Microsoft in Internet Explorer and MSXML. It is also widely recognized in the xml-stylesheet processing instruction by other browsers. In practice, therefore, users wanting to control transformation in the browser using this processing instruction are obliged to use this unregistered media type.
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