Simple Metrics Can't see how to do a pattern

Hello Xsl-list,

I'm using Xslt v1 and doing a transform to Xhtml with .net

output shard
<tr>
           <th>Amex</th>
           <th>MasterCard</th>
           <th>Visa</th>
</tr>
<tr>
           <th>1</th>
           <th>13</th>  (e.g. 9+4)
           <th>7</th>
</tr>

Just focusing on MasterCard.
<xsl:variable name="totalMasterCard"
select="sum(/leaderBoard/Table1/countType[parent::node()/productType[='Master
Card'])"/>

I'm trying to sum "countType" for Table1 elements where
productCategory=MasterCard.
Its not parsing.
What's the correct grammar for this?
I think of it as: Find all parent nodes of node where productType=MasterCard.
Sum "countType" nodes of parent node.

If "countType" GT 0 there will always be a "productType" sibling above it.

Xml shard

<leaderBoard>
       ...
  <Table1>
    <productCategory>CreditCard</productCategory>
    <productType>Amex</productType>
    <countType>1</countType>
    <countLeadSource>1</countLeadSource>
    <countRadioStation>1</countRadioStation>
  </Table1>
  <Table1>
    <productCategory>CreditCard</productCategory>
    <productType>MasterCard</productType>
    <countType>9</countType>
    <leadSource>Radio</leadSource>
    <countLeadSource>9</countLeadSource>
    <radioStation>Smooth FM</radioStation>
    <countRadioStation>9</countRadioStation>
  </Table1>
  <Table1>
    <productCategory>CreditCard</productCategory>
    <productType>MasterCard</productType>
    <countType>4</countType>
    <leadSource>Radio</leadSource>
    <countLeadSource>4</countLeadSource>
    <radioStation>TFM/Magic 1170</radioStation>
    <countRadioStation>4</countRadioStation>
  </Table1>
  <Table1>
    <productCategory>CreditCard</productCategory>
    <productType>Visa</productType>
    <countType>7</countType>
    <leadSource>Radio</leadSource>
    <countLeadSource>7</countLeadSource>
    <radioStation>Smooth FM</radioStation>
    <countRadioStation>7</countRadioStation>
  </Table1>

  <Table1>
    <productCategory>LoanClaim</productCategory>
    <productType>Secured Loan</productType>
    <countType>1</countType>
    <countLeadSource>1</countLeadSource>
    <countRadioStation>1</countRadioStation>
  </Table1>
  ...
</leaderBoard>

--
Best regards,
 Arthur                          mailto:ArthurM@xxxxxxxxxx