Associates an alias with a parsed XSL document that is held in-memory after it is first referred to. In subsequent calls to USXSL.Apply and USXSL.Apply2File,you can refer to the XML document by using the alias.
The point of using this method is that, if you need the same XSL document more than once, referring to its parsed version by alias may improve performance.
Returns the alias as a string. If the passed XSL document is invalid, an error is returned.
If xsl-document is empty, the alias-document mapping is removed from the list.
When running multiple Rules Services, a parsed XSL document mapped to an alias by one Rules Engine cannot automatically be referenced through that alias by a second Rules Engine: each engine needs to perform its own USXSL.SetXsl operation. To circumvent this limitation, use the USXSL.SetGlobalXsl method instead.