XPath query difficulty...

an XML that contains a "Routine". The routine contains "Steps". The

steps have different types. Some types of steps have more steps

contained within them (substeps). I want to get a list of all of the

steps in a routine, including any substeps...but excluding substeps

that occur in a particular type of step ("Subroutine").

I'm trying to construct an XPath and it is giving me trouble. I have
an XML that contains a "Routine". The routine contains "Steps". The
steps have different types. Some types of steps have more steps
contained within them (substeps). I want to get a list of all of the
steps in a routine, including any substeps...but excluding substeps
that occur in a particular type of step ("Subroutine").
>
Below is a simplified example XML. The query I envision would return
all of the steps in the routine, including substeps found in the
"Loop" step type and "Condition" step type...but NOT including any
steps that are anywhere within a "Subroutine" step.
>
Any thoughts? My sincerest thanks in advance!
>
-----
>
<Routine>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Loop</Type>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Loop</Type>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
</Steps>
</Step>
</Steps>
</Step>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Condition</Type>
<TrueSteps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Loop</Type>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
</Steps>
</Step>
</TrueSteps>
<FalseSteps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
</FalseSteps>
</Step>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Subroutine</Type>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
<Step>
<Type>Loop</Type>
<Steps>
<Step>
<Type>Calculation</Type>
<Other>stuff</Other>
</Step>
</Steps>
</Step>
</Steps>
</Step>
</Steps>
</Routine>

I'm trying to construct an XPath and it is giving me trouble. *I have
an XML that contains a "Routine". *The routine contains "Steps". *The
steps have different types. *Some types of steps have more steps
contained within them (substeps). *I want to get a list of all of the
steps in a routine, including any substeps...but excluding substeps
that occur in a particular type of step ("Subroutine").

//Step[not(ancestor::Step[Type = 'Subroutine'])]