Using a template's (HTML) output as with-param?

I'm pulling my hair out.

I've got an xslt template in an include file that's designed to return a
complete <a> tag, with href and inner text and all (many xslt templates
use this include so I don't have to hardcode url's in each template).
So far, so good.

However, now I need to use that template's output as a parameter to
another template that's designed to put some formatting on a table
heading.  Everything works great... Except my <a> tag disappears when I
use it this way.  In fact, *any* html markup disappears, as show below:

URL template:

        <xsl:template name="HrefTest">
                <xsl:text><h3>test</h3></xsl:text>
        </xsl:template> 

Caption template:
        <xsl:template name="TableHeader">
                <xsl:param name="caption1" />
                <xsl:param name="caption2" />
                <tr><td><h1><xsl:value-of select="$caption1"
/></h1></td></tr>
                <tr><td><xsl:value-of select="$caption2" /></td></tr>
        </xsl:template>

Usage:
        <table>
                <xsl:call-template name="TableHeader">
                        <xsl:with-param name="caption1">First
Caption</xsl:with-param>
                        <xsl:with-param name="caption2">
                                <xsl:call-template name="HrefTest" />
                        </xsl:with-param>
                </xsl:call-template>
        </table>

Expected result:
<table><tr><td><h1>First
Caption</h1></td></tr><tr><td><h3>test</h3></td></tr></table>

Actual result:
<table><tr><td><h1>First
Caption</h1></td></tr><tr><td>test</td></tr></table>

No errors or anything, the tags just disappear.  This is msxml6.  Is
this expected behavior, or do I need to somehow escape those tags, or
what?

Thanks
-b

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