[xsl] Calculating Averages

["Sendrey, John" <jsendrey@xxxxxxxxxxx>]

Just wondering how i could get an average topic score (per topic) where
score of 0 are excluded.

------
OUTPUT:
------
<topics>
	<topic>
		<id>1</id>
		<mean>5</mean>
	</topic>
	<topic>
		<id>2</id>
		<mean>3.5</mean>
	</topic>
	<topic>
		<id>3</id>
		<mean>5</mean>
	</topic>
	<topic>
		<id>4</id>
		<mean>5</mean>
	</topic>
</topics>
-----
INPUT:
-----
.
.
.
<eval>
	<id>1</id>
	<topics>
		<topic>
			<id>1</id>
			<score>5</score>
		</topic>
		<topic>
			<id>2</id>
			<score>4</score>
		</topic>
		<topic>	
			<id>4</id>
			<score>5</score>
		</topic>
	</topics>
</eval>
<eval>
	<id>5</id>
	<topics>
		<topic>	
			<id>2</id>
			<score>3</score>	
		</topic>
		<topic>	
			<id>3</id>
			<score>5</score>
		</topic>
		<topic>
			<id>4</id>
			<score>0</score>
		</topic>
	</topics>
</eval>
.
.
.

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