Description:
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When performing an XSLT transformation it is useful to read the attributes of the <xsl:output> tag, most notably for me the media-type attribute.  Libxslt provides an interface to these attributes in the xsltStylesheetPtr object returned by xsltStylesheetDoc():

xmlChar *method;            /* the output method */
xmlChar *methodURI;         /* associated namespace if any */
xmlChar *version;           /* version string */
xmlChar *encoding;          /* encoding string */
int omitXmlDeclaration;     /* omit-xml-declaration = "yes" | "no" */
int standalone;             /* standalone = "yes" | "no" */
xmlChar *doctypePublic;     /* doctype-public string */
xmlChar *doctypeSystem;     /* doctype-system string */
int indent;                 /* should output being indented */
xmlChar *mediaType;         /* media-type string */

The only way to access them in PHP is to process the stylesheet document as an XML document.  It'd be really useful if PHP's XSLTProcessor had a direct interface to these C properties. :)