Add a libxslt parameter ; equivalent to providing --param <QNAME>:<XPATH> via command line.
Table 3.1. Addparam usage
| addparam <QNAME> <XPATH> (The <XPATH> must not contain any spaces nor double quotation marks.) |
| addparam <QNAME> "<XPATH>" (Must not contain double quotation marks in <XPATH>) |
