Excluding values from XSL Sum.

What I am doing: I am attempting to sum values.

The problem: The XML file includes characters that cannot be summed. I am unable to edit the XML data file. I need to locate a method to exclude values that match a certain character and sum the remaining values. (eg. 22+ 9 + '-' + 5) Obviously the '-' causes the XSL sum function to return "NaN"

I am still relatively new to XSL and will freely admit that I conceptually know how do to this, and in an OOP way I know what to do, but I do not know the syntax or language of XSL well enough to achieve the required functionality.

While this is not a "for-each" there is only one key (<key>0..10</key> is a sibling of NodeG which is Value) and value pair per occurrence of NodeB.

sum(NodeA/NodeB/NodeC/NodeD/NodeE/NodeF[key='0..10']/NodeG)

The above summation correctly sums values if there are no random non numeric characters. The below XML example contains two "Values"; 29 and -. Currently when running the above sum I get "NaN". I would like to exclude the '-' and get 29.

In attempting to do some research it appears that I might be able to use the "translate(str, str, str) function, but am not sure how this can be incorporated into the sum function.

Thoughts?

Example XML structure:
<NodeA>
  <NodeB>
    <NodeC>
      <NodeD>
        <NodeE>
          <NodeF>
              <key>0..10</key>
              <NodeG>29</NodeG>
           </NodeF>
         </NodeE>
        </NodeD>
      </NodeC>
     </NodeB>
     <NodeB>
    <NodeC>
      <NodeD>
        <NodeE>
          <NodeF>
              <key>0..10</key>
              <NodeG>-</NodeG>
           </NodeF>
         </NodeE>
        </NodeD>
      </NodeC>
     </NodeB>
  </NodeA>
nmluthyAsked:
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Geert BormansConnect With a Mentor Information ArchitectCommented:
add a test to see if the node can be casted to a number

sum(NodeA/NodeB/NodeC/NodeD/NodeE/NodeF[key='0..10']/NodeG[not(string(number(.)) = 'NaN')])
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nmluthyAuthor Commented:
Thanks Gertone.

If I may ask a follow up questions pertaining to understanding why that works. (Great to have a working solution, but I also want to understand it).

Rephrasing: We get the value (NodeG) an we are only using numbers that do not return a unacceptable (NaN) format? I am a little fuzzy on what the "(.)" means following number.

Thanks again!
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Geert BormansInformation ArchitectCommented:
. is current context
number(.) casts the content of the current context (element NodeG) to a number, it will return 'NaN' if not possible
then we cast to string and compare with 'NaN'
if that is not() true we use the node
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nmluthyAuthor Commented:
Awesome thanks. I appreciate the knowledge (and assistance on solution).
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Geert BormansInformation ArchitectCommented:
welcome
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