XSL: Check if item exists in element - cleaner solution? - xslt-1.0

Question

Is it possible to have a better solution for the following:
Input xml
<product>
<text>
<languageId>en-us</languageId>
<description>some text en us</description>
</text>
<text>
<languageId>en-gb</languageId>
<description>some text en gb</description>
</text>
<text>
<languageId>en-us</languageId>
</text>
<product>
Output xml
<specifications>some text en us</specifications>
So, if there is a description with languageId = en-us and there is text present, then this text will be placed in the output xml, otherwise the element receives the attribute value xsi:nil=true
xslt version must be 1.0
XSLT
<ns0:specifications>
<!-- First loop, check if en-us is present, if so, check if there is a text! -->
<!-- If the 2 requirements are met, then this Txt element is used -->
<xsl:for-each select="s0:text">
<xsl:if test="translate(s0:LanguageId/text(),$smallcase,$uppercase)=translate('en-us',$smallcase,$uppercase)">
<xsl:if test="s0:Txt!=''">
<xsl:value-of select="s0:Txt/text()" />
</xsl:if>
</xsl:if>
</xsl:for-each>
<!-- Second loop, checks are the same. This loop is needed because xsl variables are immutable. If there is a better solution, just change the code!! -->
<!-- If the 2 requirements are met, then the variable is marked as true, else it's empty -->
<xsl:variable name="isEnUsPresent">
<xsl:for-each select="s0:text">
<xsl:if test="translate(s0:LanguageId/text(),$smallcase,$uppercase)=translate('en-us',$smallcase,$uppercase)">
<xsl:if test="s0:Txt!=''">
<xsl:value-of select="1" />
</xsl:if>
</xsl:if>
</xsl:for-each>
</xsl:variable>
<!-- if the variable is empty, set the attribute value xsi:nil=true like below -->
<xsl:choose>
<xsl:when test="$isEnUsPresent=''">
<xsl:attribute name="xsi:nil">
<xsl:value-of select="'true'" />
</xsl:attribute>
</xsl:when>
</xsl:choose>
</ns0:specifications>
Regards

Answer 1

As simple as this:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
exclude-result-prefixes="xsi">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/">
<specifications>
<xsl:apply-templates select="*"/>
</specifications>
</xsl:template>
<xsl:template match="text[languageId='en-us']/description">
<xsl:value-of select="."/>
</xsl:template>
<xsl:template match="/*[not(text[languageId='en-us']/description)]">
<xsl:attribute name="xsi:nil">true</xsl:attribute>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
When this transformation is applied on the provided XML document:
<product>
<text>
<languageId>en-us</languageId>
<description>some text en us</description>
</text>
<text>
<languageId>en-gb</languageId>
<description>some text en gb</description>
</text>
<text>
<languageId>en-us</languageId>
</text>
</product>
the wanted, correct result is produced:
<specifications>some text en us</specifications>
When the same transformation is applied to this XML document:
<product>
<text>
<languageId>en-us-XXX</languageId>
<description>some text en us</description>
</text>
<text>
<languageId>en-gb</languageId>
<description>some text en gb</description>
</text>
<text>
<languageId>en-us</languageId>
</text>
</product>
again the wanted, correct result is produced:
<specifications xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>