[xsl] simple summation question

["Lee, Insoo" <Insoo.Lee@xxxxxx>]

  Hello - a quick simple question, how would get a subTotal for someValue by
entity as shown below?
  I can get a grand total by using sum(/report/entity/row/someValue)..

  Thanks

   <report>
	<entity>
		<row>
			<someValue>5</someValue>
		</row>
		<row>
			<someValue>6</someValue>
		</row>
		<row>
			<someValue>7</someValue>
		</row>
	</entity>

	<entity>
		<row>
			<someValue>8</someValue>
		</row>
		<row>
			<someValue>9</someValue>
		</row>
		<row>
			<someValue>10</someValue>
		</row>
	</entity>
</report>



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