Can I parameterise image attributes?

Question

I am displaying an image in my BI Publisher report, sourcing it from a blob.
<xsl:if test="not(FILENAME='')">
  <fo:instream-foreign-object content-type="image/gif" height="5cm" width="5cm">
    <xsl:value-of select="LOGO_IMAGE"/>
  </fo:instream-foreign-object>
</xsl:if>It works fine, until some of the images get larger heights or widths - I haven't figured out the relation yet, but I thought if I could parameterise the height and width properties, perhaps I could make the report happier.
Is there a way to pass XML values into these fields, such as something like
<xsl:if test="not(FILENAME='')">
  <fo:instream-foreign-object content-type="image/gif" height="SQL_HEIGHT" width="SQL_WIDTH">
    <xsl:value-of select="LOGO_IMAGE"/>
  </fo:instream-foreign-object>
</xsl:if>Which doesn't work, but I thought there might be a way if I got the syntax right...
Thanks.
Scott

Answer 1

I haven't successfully parameterised either those image attribute fields, or the usage of
<fo:external-graphic src="http://my_url:7021/i/loadingAnimation.gif"/> In efforts to do something constructive I tried to parameterise the external-graphic reference instead - since I can't seem to generate anything larger than 32kb worth of XML.
I tried variations of the following, with no success
<?IMAGE_URL?> -- displays the url text
<fo:external-graphic src="?IMAGE_URL?"> -- displays nothing
<fo:external-graphic src="IMAGE_URL"> -- displays nothing
<fo:external-graphic src=?IMAGE_URL?> -- displays nothing
<fo:instream-foreign-object content-type="image/gif">
<xsl:value-of select="IMAGE_URL"/>
</fo:instream-foreign-object> -- displays nothing, but did expand area consumed
Is there syntax I should be using instead, or is this not possible?
Cheers.