XPATH expression, first child of node

["xsl list" <xsl_list@xxxxxxxxxxx>]

In the xsl template I want to test if TR is the first TR child of TABLE or 
the first TR decendent of the first child of TABLE that is not TLT. How 
would I write such an expression?
In the below example, OTHER_TAG is optional and can be any tag.
<TABLE>
	<TLT/>
	<OTHER_TAG>
		<TR/>
	</OTHER_TAG>
	<TR/>
</TABLE>

<xsl:template match="TR">
	<xsl:if test="***EXPRESSION***"/>
</xsl:template>
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