Efficiency, use param in key?

On working a stylesheet that processes a multimedia-course storyboard and
returns text, CRLF-delimited, sorted, lowercase, no-duplicates filenames I
have several questions:

1. is there anything I should do to improve it (make it more efficient)?

2. is it possible to use the param "ele" in key, apply-templates and
template? This would make it possible for a single stylesheet to look for
file_audio, file_video or file_graphic tags.

3. Or perhaps I should actually ask, is there a way to rework my approach
so I can parameterize it?

Stylesheet:

<xsl:output method="text" encoding="ISO-8859-1" indent="no"/>

<xsl:param name="ele">file_audio</xsl:param>

<xsl:variable name="lc" select="'abcdefghijklmnopqrstuvwxyz'"/>
<xsl:variable name="uc" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/>

<xsl:key name="fn" match="file_audio" use="@fileref"/>

<xsl:template match="/">
    <xsl:apply-templates select="//file_audio">
        <xsl:sort select="@fileref"/>
    </xsl:apply-templates>
</xsl:template>

<xsl:template match="file_audio[generate-id() = generate-id(key('fn',
@fileref)[1])]">
    <xsl:value-of select="translate(@fileref, $uc, $lc)"/>
    <xsl:text disable-output-escaping="yes">&#xD;&#xA;</xsl:text>
</xsl:template>

Excerpts of sample input:

<frame id="01" type="a" parms="a">
<txt_scr lang="ENG"/>
<txt_aud>Click on a button in front of the module you wish to begin
and...</txt_aud>
<file_audio fileref="coursemenu.mp3"/>
</frame>
.
.
.
<frame id="01">
<txt_scr lang="ENG">Welcome to the Intercom Plus training!</txt_scr>
<txt_avi>{Zelda} Hi, welcome to the Intercom Plus Training! I am Zelda
Morales...</txt_avi>
<file_avi start_frame="1" end_frame="359" fileref="__A_.0010.001.avi" />
</frame>
.
.
.

TIA
Chris

Christopher Dant
Technology Director
Jack Morton Worldwide
Christopher_Dant@xxxxxxxxxxxxxx



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