Sample Pipeline to test Calabash's caching of loaded source (assumes a loadme.xml that contains a valid xi:include element)

load-xinclude.xpl

<?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" name="main">
    <p:input port="source">
        <p:inline>
            <doc>Hello world!</doc>
        </p:inline>
    </p:input>
    <p:output port="result">
        <p:pipe port="result" step="test"/>
    </p:output>

    <p:load href="./loadme.xml" name="loaded"/>

    <p:xinclude fixup-xml-base="true" name="xinclude"/>

    <p:sink/>

    <p:xslt name="test">
        <p:input port="source">
            <p:pipe step="main" port="source"/>
        </p:input>
        <p:input port="parameters">
            <p:empty/>
        </p:input>
        <p:input port="stylesheet">

            <p:inline>
                <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                    xmlns:c="http://www.w3.org/ns/xproc-step" version="2.0">
                    <xsl:template match="/">
                        <xsl:copy-of select="document('./loadme.xml')"/>
                    </xsl:template>

                </xsl:stylesheet>
            </p:inline>
        </p:input>
    </p:xslt>

</p:declare-step>