The new security preferences. The following constants can be ORed:
XSL_SECPREF_READ_FILE,
XSL_SECPREF_WRITE_FILE,
XSL_SECPREF_CREATE_DIRECTORY,
XSL_SECPREF_READ_NETWORK,
XSL_SECPREF_WRITE_NETWORK. Alternatively,
XSL_SECPREF_NONE or
XSL_SECPREF_DEFAULT can be passed.