XSL IF is causing an error, removing it my code works. What is wrong?

Question

I have the following code. I am trying to use a simple IF within a FOR-EACH. I simplified it for this example here. When I add the follwowing IF (which in this example should always be true), my code bombs out. If I remove the IF test altogether, code runs fine.

  <xsl:if test="contains('apple','ap')">

Here is the full code:

        <xsl:for-each select="$external-doc/document(.)/items/item">
            <xsl:if test="contains('apple','ap')">
                <xsl:sort select="concat(substring(pubDate,7,4), substring(pubDate,1,2),substring(pubDate,4,2))" order="descending"/>
                <item>
                    <xsl:attribute name="href" select="concat($base-url,@href)"/>
                    <xsl:apply-templates select="attribute()[not(name() = 'href')]|node()[not(name() = 'hero-image') and not(name() = 'image')]" /> 
                    <xsl:if test="image">
                        <image>
                            <xsl:choose>
                                <xsl:when test="not(contains(image/img/@src,'://'))">
                                    <img>
                                        <xsl:attribute name="src" select="concat($base-url,image/img/@src)"/>
                                        <xsl:apply-templates select="image/img/attribute()[not(name() = 'src')]" />
                                    </img>
                                </xsl:when>
                                <xsl:otherwise><xsl:apply-templates select="image/img" /></xsl:otherwise>
                            </xsl:choose>
                        </image>
                    </xsl:if>
                    <searchtags>{string-join(tags/tag, ',')}</searchtags>
                </item> 
            </xsl:if>
        </xsl:for-each>

What am I doing wrong with the test?

Answer 1

I presume your error message says something like:

XTSE0010 An xsl:if element must not contain an xsl:sort element

which is self-explanatory.