====== Modifying the TEI XSL stylesheets ======
[[http://www.oxygenxml.com/|oXygen XML editor]] comes with a set of [[http://www.oxygenxml.com/doc/ug-editor/topics/author-teip5-doc-type.html|TEI XSL stylesheets]] that can be modified to meet individual needs. You have to know a few things to be able to do it, however; things which I tend to forget again and again.
===== Location of TEI XSL =====
In oXygen 14, TEI XSL stylesheets (e. g. for transforming to XHTML) are here:
<code xml>
Oxygen XML Editor 14/frameworks/tei/xml/tei/stylesheet/xhtml2/tei.xsl
</code>

===== Including and importing XSL =====
Files that contain instructions to be modified have to be imported; local information (e. g. language specific) will be included:
<code xml>
<xsl:import href="/home/neven/Oxygen XML Editor 14/frameworks/tei/xml/tei/stylesheet/xhtml2/tei.xsl"/>
<xsl:include href="/home/neven/trunk/croala-code/xsl/i18n.xsl"/>
<xsl:include href="croala-param.xsl"/>
</code>
===== Modifying existing instructions =====
Transform element ''supplied'' to a ''span class="supplied"'':
<code xml>
    <xsl:template match="tei:supplied">
        <span class="supplied">
            <xsl:apply-templates/>
        </span>
    </xsl:template>
</code>
Conditional transformation: transform element ''pb'' to a link only if it has a ''@facs'' attribute; use the value of ''@facs'' to build a hyperlink:
<code xml>
    <xsl:template match="tei:pb[@facs]">
        <xsl:element name="a">
            <xsl:attribute name="href">
                <xsl:value-of select="@facs"/>
            </xsl:attribute>
            <xsl:text>[ Facsimile pag. </xsl:text><xsl:value-of select="@n"/><xsl:text> ]</xsl:text>
        </xsl:element>
    </xsl:template>
</code>