XProc steps
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p:error
With the help of the <p:error> step, user-defined (dynamic) error outputs can be generated. For example, it makes sense when using decision-based steps such as <p:choose>. At its (not primary) input port the appropriate error ouput is defined and outputted at the output port (“result“). With the help of the three options “code-prefix“, “code“ and “code-namespace“ the user can mark the error accordingly. In this way, a prefix can be defined in addition to a namespace in order to realise a reasonable output of the error.
Example
Here, a simple error output is demonstrated.
<?xml version="1.0" encoding="UTF-8"?>
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" xmlns:c="http://www.w3.org/ns/xproc-step" version="1.0">
<p:output port="result"/>
<p:error code="error" code-namespace="http://www.example.de/error" code-prefix="tg">
<p:input port="source">
<p:inline>
<message>An error has occurred...</message>
</p:inline>
</p:input>
</p:error>
</p:declare-step>
The Calabash processor shows the following output:
tg:error : An error has occurred...