xslt_setopt() sets the options specified by newmask on the given processor. Returns the number of previous mask is possible, TRUE otherwise, FALSE in case of an error.
newmask is a bitmask constructed with the following constants:
XSLT_SABOPT_PARSE_PUBLIC_ENTITIES - Tell the processor to parse public entities. By default this has been turned off.
XSLT_SABOPT_DISABLE_ADDING_META - Do not add the meta tag "Content-Type" for HTML output. The default is set during the compilation of the processor.
XSLT_SABOPT_DISABLE_STRIPPING - Suppress the whitespace stripping (on data files only).
XSLT_SABOPT_IGNORE_DOC_NOT_FOUND - Consider unresolved documents (the document() function) non-lethal.