XSLT template not applying to newly-created elements

I am using XSLT 2.0. Inside a xsl:template (template-1), I use xsl:analyze-string to create new span elements with an xml:lang attribute. I have a second template (template-2) that adds a class attribute to elements that contain a xml:lang attribute. I cannot figure out how to have the newly-created span elements created by the first template be processed by the second. How can I have the second template operate on results from the first?

Example:

Input: The base form of a noun is technically called a prātipadika (प्रातिपदिक).

Desired Output: The base form of a noun is technically called a prātipadika (प्रातिपदिक). This correct output has a final span with both xml:lang and class attributes.

Stylesheet Output: The base form of a noun is technically called a prātipadika (प्रातिपदिक). This incorrect output is missing class="sa-lang-deva" on the final span.

(This stylesheet helps to work around the deficient CSS support of a certain eBook reader.)

Here is my stylesheet:


<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0"
                xmlns:xsl="http://ift.tt/tCZ8VR"
                xmlns="http://ift.tt/lH0Osb"
                xpath-default-namespace="http://ift.tt/lH0Osb"
                xmlns:xml="http://ift.tt/1ikcaie"
                xmlns:epub="http://ift.tt/1io14WJ">

    <xsl:output method="xhtml" encoding="utf-8" indent="no"/>

    <xsl:template match="/">
        <html xmlns="http://ift.tt/lH0Osb" xmlns:epub="http://ift.tt/1io14WJ">
            <xsl:apply-templates/>
        </html>
    </xsl:template>

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

    <!-- Template-1: Add xml:lang attribute to Devanagari text. -->
    <xsl:template match="element()/text()">
        <xsl:variable name="textValue" select="."/>
        <xsl:analyze-string select="$textValue" regex="([&#x0900;-&#x097f;]+)((\s+[&#x0900;-&#x097f;]+)*)">
            <xsl:matching-substring>
                <span xml:lang="sa-Deva"><xsl:value-of select="."/></span>
            </xsl:matching-substring>
            <xsl:non-matching-substring>
                <xsl:value-of select="."/>
            </xsl:non-matching-substring>
        </xsl:analyze-string>
    </xsl:template>

    <!-- Template-2: Add lang-* class attribute when xml:lang attribute present. -->
    <xsl:template match="*[@xml:lang]">
        <xsl:call-template name="addClass">
            <xsl:with-param name="newClass">lang-<xsl:value-of select="@xml:lang"/></xsl:with-param>
        </xsl:call-template>
    </xsl:template>

    <!-- Add a class attribute to an element. -->
    <xsl:template name="addClass">
        <xsl:param name="newClass"/>
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:attribute name="class"><xsl:value-of select="normalize-space(concat(@class, ' ', lower-case($newClass)))"/></xsl:attribute>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>

XSLT template not applying to newly-created elements

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