Passing document() parameter to an xslt in XProc pipeline

问题

I've set up an XProc pipeline wherein I have a <p:xslt> step. Amoung the parameters of this stylesheet, I have an parameter which is a document() node:

This is the km_to_dita.xsl stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:dctm="http://www.documentum.com" xmlns:ale="http://www.amplexor.com/alcatel"
    exclude-result-prefixes="xs dctm ale" version="2.0">

    <xsl:param name="conf-base" select="'file:/D:/Temp/ALE_config/'" />

    <xsl:param name="output-base" select="''"/>

    <xsl:param name="lang" select="/element()[1]/@language"/>

    <xsl:param name="graphics-reference-names" as="document-node()*" />

    <!-- my templates stuff... -->
</xsl:stylesheet>

Thus I am calling this XSLT in my pipeline with the following step (for demonstration purpose it is set with a <p:inline> but it is aimed to be bound to the result port of a step):

<p:xslt name="km-dm-to-dita">
    <p:input port="source">
        <p:pipe port="list-dm" step="list-csv"/>
    </p:input>
    <p:input port="stylesheet">
        <p:document href="km_to_dita.xsl"/>
    </p:input>
    <p:with-param name="output-base" select="$dita.data-dir"/>
    <p:with-param name="conf-base" select="$config-dir"/>
    <!--<p:with-param name="graphics-reference-names">
        <p:pipe port="result" step="get-figure-references"/>
    </p:with-param>-->
    <p:with-param name="graphics-reference-names">
        <p:inline>
            <graphic-ids>
                <reference type="symbol" document="dm09011b0281121ef3.xml#G4" filename="g09011b0281d9c449.gif"/>
                <reference type="symbol" document="dm09011b0281121ef3.xml#G3" filename="g09011b0281d9c449.gif"/>
                <reference type="figure" document="dm09011b0281121ef3.xml#F33" filename="g09011b0281d9c44d.gif"/>
                <reference type="symbol" document="dm09011b0281121ef3.xml#G5" filename="g09011b0281d9c451.gif"/>
                <reference type="figure" document="dm09011b0281121ef5.xml#F116" filename="g09011b0281d9c458.gif"/>
            </graphic-ids>
        </p:inline>
    </p:with-param>

    <p:with-option name="output-base-uri" select="$dita.data-dir"/>
</p:xslt>

But it fails when running it with XML Calabash (in oXygenXML), the error being raised is (sorry folks it's all the information I have) however have determined that it's the <p:with-param name="graphics-reference-names"> that causes this error):

null

Any idea?

回答1:

I finally found what's going wrong with it... First of all, the <p:with-param> is missing the required @select attribute, as mentioned in the XProc, but strangely oXygen didn't raise any validating error for my pipeline.

Thus the pipeline may be fixed that way:

<p:with-param name="graphics-reference-names" select="/">
    <p:inline>
        <graphic-ids>
            <reference type="symbol" document="dm09011b0281121ef3.xml#G4" filename="g09011b0281d9c449.gif"/>
            <reference type="symbol" document="dm09011b0281121ef3.xml#G3" filename="g09011b0281d9c449.gif"/>
            <reference type="figure" document="dm09011b0281121ef3.xml#F33" filename="g09011b0281d9c44d.gif"/>
            <reference type="symbol" document="dm09011b0281121ef3.xml#G5" filename="g09011b0281d9c451.gif"/>
            <reference type="figure" document="dm09011b0281121ef5.xml#F116" filename="g09011b0281d9c458.gif"/>
        </graphic-ids>
    </p:inline>
</p:with-param>

With the solution above, XSLT fails because the parameter is casted to a string:

Required item type of value of variable $graphics-reference-names is document-node(); supplied value has item type xs:string

This is the other issue that makes the problem unsolvable: XProc allows only parameters to be set as atomic values, as explained in XSLT with XProc - parameter binding in the required type.

来源：https://stackoverflow.com/questions/40512887/passing-document-parameter-to-an-xslt-in-xproc-pipeline