CODEWITHSUNDEEP
xmlxsltrecursion
James H
James H

Reputation: 629

Remove empty xml elements recursively with XSLT

I am trying to recursively remove 'empty' elements (no children, no attribute or empty attribute) from the xml. This is the XSLT I have

<xsl:template match="node()|@*">
    <xsl:copy>
        <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="*[not(*) and
                       string-length(.)=0 and
                       (not(@*) or @*[string-length(.)=0])]">
    <xsl:apply-templates/>
</xsl:template>

This is the input XML. I expect this XML to be transformed to a empty string

<world>
    <country>
        <state>
            <city>
                <suburb1></suburb1>
                <suburb2></suburb2>
            </city>
        </state>
    </country>
</world>

But instead I am getting 

<world>
    <country>
        <state/>
    </country>
</world>

Can anyone help? I've researched many threads in the forum but still no luck.

Upvotes: 2

Views: 2907

Answers (2)

michael.hor257k
michael.hor257k

Reputation: 116993

The condition not(*) is false for any element that has children - regardless of what the children contain.

If you want to "prune" the tree of any branches that do not carry "fruit", try:

XSLT 1.0

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:template match="*[descendant::text() or descendant-or-self::*/@*[string()]]">
    <xsl:copy>
        <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="@*[string()]">
    <xsl:copy/>
</xsl:template>

</xsl:stylesheet>

Upvotes: 7

Davio
Davio

Reputation: 4737

So, fighting whitespace, try this:

<xsl:template match="node()|@*">
    <xsl:copy>
        <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="*[not(*) and
                       string-length(normalize-space(.))=0 and
                       (not(@*) or @*[string-length(normalize-space(.))=0])]">
    <xsl:apply-templates/>
</xsl:template>

Upvotes: 1

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