Select node based on another node

Question

Hello - If I have XML code such as:
<ROWSET>
−<ROW>
<AREA>AAA</AREA>
<ACTIVITY>ACTIVE</ACTIVITY>
<TOTAL>4</TOTAL>
</ROW>
−<ROW>
<AREA>AAA</AREA>
<ACTIVITY>NOTACTIVE</ACTIVITY>
<TOTAL>1</TOTAL>
</ROW>
−<ROW>
<AREA>AAA</AREA>
<ACTIVITY>INOP</ACTIVITY>
<TOTAL>2</TOTAL>
</ROW>
−<ROW>
<AREA>BBB</AREA>
<ACTIVITY>NOTACTIVE</ACTIVITY>
<TOTAL>20</TOTAL>
</ROW>
−<ROW>
<AREA>BBB</AREA>
<ACTIVITY>OFFLINE</ACTIVITY>
<TOTAL>2</TOTAL>
</ROW>
−<ROW>
<AREA>BBB</AREA>
<ACTIVITY>INOP</ACT_LEVEL>
<TOTAL>32</TOTAL>
</ROW>
−<ROW>
<AREA>CCC</AREA>
<ACTIVITY>ACTIVE</ACTIVITY>
<TOTAL>2</TOTAL>
</ROW>
−<ROW>
<AREA>CCC</AREA>
<ACTIVITY>INOP</ACTIVITY>
<TOTAL>2</TOTAL>
</ROW>
</ROWSET>
How can I retrieve the TOTAL data based on the value of ACTIVITY?
Can I use something like:
<RowData>
<xsl:for-each-group select=".//ROW" group-by="AREA" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<Cell>
<xsl:if test="count(current-group()/ACTIVITY[.='INOP'])">
<xsl:value-of select="???????????????)" />
</xsl:if>
</Cell>
</xsl:for-each-group>
</RowData>

Answer 1

I knew this would be ridiculously easy for a smart person out there. The final answer turned out to be:
<RowData>
<xsl:for-each-group select=".//ROW" group-by="AREA"xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<Cell>
<xsl:if test="current-group()/ACTIVITY[.='OFFLINE']">
<xsl:value-of select="current-group()[./ACTIVITY='OFFLINE']/TOTAL" />
</xsl:if>
</Cell>
</xsl:for-each-group>
</RowData>
I wasn't looking to sum the TOTAL values (I didn't explain myself well), I was looking to grab the individual value from the TOTAL node (I think I'm saying that right) based on what the value was in the ACTIVITY node - in this case, OFFLINE.
I did try the "current-group()/TOTAL" but that just gave me the first TOTAL value, which in my example, would have been 20 from NOTACTIVE node.