Caveat Lector

I don’t want to admit how long it took me to get this right. Weeks. A small glitch elsewhere in the stylesheet that would occasionally throw a wobbly and occasionally not did not help matters. (Have I mentioned that debugging XSLT server-side is an inordinate pain in the posterior? I haven’t? Well, it is.)

Still. If you hate as much as I do that community and collection logos live inside the community/collection box and not in the h1 of the page the way $DEITY intended, read on.

I actually had to comment out the ds-logo-wrapper bit in DS-METS-1.0-DIM.xsl, because nothing I did in my theme seemed to override it. The other sneaky way to dispense with it is to set it to display:none in your CSS.

For our first trick, we will fossick around in the METS and the DRI to determine whether there’s a logo at all, and whether we’re actually on a community or collection page. Add the following variables to the top level of your theme’s stylesheet (look for the context-path variable and put them beside those):

<!-- Whether the current page has a logo associated with it. -->
    <xsl:variable name="has_logo" select="boolean(/dri:document/dri:meta/dri:objectMeta/dri:object/mets:METS/mets:fileSec/mets:fileGrp[@USE='LOGO'])”/>

<!–  Whether the current page is a community or collection home page. –>
     <xsl:variable name=”is_comm” select=”boolean(/dri:document/dri:body/dri:div[@n='community-home'])”/>
    <xsl:variable name=”is_coll” select=”boolean(/dri:document/dri:body/dri:div[@n='collection-home'])”/>

Next, we will go into the template where we want the logo to live and add this to it:

<xsl:if test="$is_coll or $is_comm">
  <img>
    <xsl:attribute name="src">
      <xsl:value-of select="/dri:document/dri:meta/dri:objectMeta/dri:object/mets:METS/mets:fileSec/mets:fileGrp[@USE='LOGO']/mets:file/mets:FLocat[@LOCTYPE='URL']/@xlink:href”/>
    </xsl:attribute>
    <xsl:attribute name=”class”>logo</xsl:attribute>
    <xsl:attribute name=”id”>commcollogo</xsl:attribute>
    <xsl:choose>
      <xsl:when test=”$is_comm”>
        <xsl:attribute name=”alt”>xmlui.dri2xhtml.METS-1.0.community-logo-alt</xsl:attribute>
        <xsl:attribute name=”attr” namespace=”http://apache.org/cocoon/i18n/2.1″>alt</xsl:attribute>
      </xsl:when>
      <xsl:when test=”$is_coll”>
        <xsl:attribute name=”alt”>xmlui.dri2xhtml.METS-1.0.collection-logo-alt</xsl:attribute>
        <xsl:attribute name=”attr” namespace=”http://apache.org/cocoon/i18n/2.1″>alt</xsl:attribute>
      </xsl:when>
    </xsl:choose>
  </img>
</xsl:if>

There is an additional wrinkle if (as I did) you want the logo to live in the ds-div-head with the community’s name in it. For this, you need to test whether a given head on the page is an h1, or you’ll get the damn logo on every head on the page. (Yep. I made that mistake.)

The fix is relatively easy; just change the xsl:if line above to <xsl:if test="$head_count=1 and ($is_coll or $is_comm)"> and you’re golden.

I hope somebody else uses this. Figuring it out drove me crazy for weeks.