How to count the nodes based on attribute presence

Hi All,

In my XML a tag is such that it can or cannot contain
an attribute like the following:
------
<Task due="true">
<Do>Call mother</Do>
</Task>
<Task>
<Do>Make a report</Do>
</Task>
-----

I want to count the Task nodes which do not contain
attribute due="true"

One way is to count all the Task nodes and nodes that
contain the attribute, then do the subtraction.
If direct way is not there then I will do like this
only.

Any suggestion will be appreciated


Thanks in advance
Deep

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