xproc/extensions — pull request #8 by josteinaj (2014-02-16 18:49:34+00:00)
Title: this is a proposed change to the `p:error` step

Changes from v1:
* The input port has been dropped and replaced with a "message" option.
* `param{N}` options are accepted for use as replacements for `${N}` in the message string.