Adding a border to graphics

Hi guys!

I have encountered the following issue:

I wanna have two kinds of images in my documents: 
with a border and without a border.

So I did two things:

1) in my template for bordered images I inserted a
"role" attribute with value "bordered" like that:

<xsl:template match="diagram_border"> 
<xsl:element name="figure">
    <xsl:attribute name="id">
      <xsl:value-of select="@ref"/>
    </xsl:attribute>
    <xsl:attribute name="role">
    <xsl:value-of select="@bordered"/>
    </xsl:attribute>	    
    <title>
      <xsl:value-of select="@t"/>
    </title>
    <mediaobject>
      <imageobject>
        <xsl:element name="imagedata">
          <xsl:attribute
name="width">80%</xsl:attribute>
          <xsl:attribute
name="scalefit">1</xsl:attribute>
          <xsl:attribute name="fileref">
	  <xsl:value-of select="concat('images/', @ref,
'.png')"/>
          </xsl:attribute>
        </xsl:element>
      </imageobject>
    </mediaobject>
  </xsl:element>
</xsl:template>


2) I added the following in the customization layer:

<xsl:template match="imagedata">
<fo:external-graphic>
    <xsl:if test="ancestor::figure[role|@bordered]">
    <xsl:attribute
name="border-color">black</xsl:attribute>
    <xsl:attribute
name="border-style">solid</xsl:attribute>
    </xsl:if>
</fo:external-graphic>
</xsl:template>

However, it does not work. Please, advise!

Thanks in advance,
Nancy


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