Catching an XD0029

Hi.

I'm having a problem catching the XD0029 dynamic error thrown from a p:data
where the referenced file does not exist. I'm using oXygen 12.0 with the
bundled Calabash. Here's the pipeline:


<?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:input port="source"/>
    <p:output port="result"/>

    <p:try>
        <p:group>
            <p:identity>
                <p:input port="source">
                    <p:data href="doesNotExist"/>
                </p:input>
            </p:identity>
        </p:group>
        <p:catch>
            <p:identity>
                <p:input port="source">
                    <p:inline>
                        <c:data/>
                    </p:inline>
                </p:input>
            </p:identity>
        </p:catch>
    </p:try>

</p:declare-step>


"err:XD0029 : XProc error err:XD0029 It is a dynamic error if the document
referenced by a p:data element does not exist, cannot be accessed, or cannot
be encoded as specified. /my/local/filesystem/path/doesNotExist (No such
file or directory)"

How come the p:try doesn't catch this error?

Regards
Jostein