RE: Pretty printing an XML document

John,

For XML, there is a serialization setting you can use: serialization=”map{ ‘indent’: true() }’”

It can go either on an output port or used directly, for example on p:store.

In some cases what the processor gives is not quite what we want, in which case XSLT is warranted (but generally not output/@indent, which will have the same limitations), but ‘by hand’.

Examples are not hard to find e.g. in the Github repo oscal-xproc3 –

HTH,
Wendell

From: John Dziurlaj <john@turnout.rocks>
Sent: Friday, January 17, 2025 7:10 AM
To: xproc-dev@w3.org
Subject: Pretty printing an XML document

Suppose I want to pretty-print an XML document using XProc. Of course I can use XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" name="pipeline"
    version="3.0">
    <p:input port="source" primary="true" />
    <p:output port="result" primary="true" />
    <p:xslt>
        <p:with-input port="stylesheet">
            <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="3.0">
                <!-- Output formatted XML -->
                <xsl:output method="xml" indent="yes" />
                <!-- Identity transformation template -->
                <xsl:template match="@* | node()">
                    <xsl:copy>
                        <xsl:apply-templates select="@* | node()" />
                    </xsl:copy>
                </xsl:template>
            </xsl:stylesheet>
        </p:with-input>
    </p:xslt>
</p:declare-step>

But this feels like a kludge. Is there an XProc3 native way?

John Dziurłaj /d͡ʑurwaj/