Hey, i am sorry that i kept asking all of these adding questions. I am trying to number all of the elements of the same type. However, if an element has a certian attribute, then add the attribute and kept counting as normal. Here would be a given input:

<a/>
<a/>
<a/>
<a val="2"/>
<a/>
<a/>
<a val="3"/>
<a/>

and i would like to get this output somehow.
 <b number="1"/>
 <b number="2"/>
 <b number="3"/>
 <b number="5"/>
 <b number="6"/>
 <b number="7"/>
 <b number="10"/>
 <b number="1!"/>

Thanks in advance to anyone that can help!

If you're not worried about efficiency, then

<xsl:template match="a">
  <b number="{count((.|preceding-sibling::a)[not(@val)]) +
                sum((.|preceding-sibling::a)/@val)}"/>
</xsl:template>

For a more efficient solution you need a recursive template that walks over the siblings accumulating a running total as it goes.



Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference