If you want X to differ from execution to execution you shoud define it as a 
parameter inside of stylesheet:
<xsl:param name="count" select="3"/>
3 would be a default value of it.
Code is almost the same:
<xsl:for-each 
select="/Products/ProductsItem/Identifiers/Identifier[position() mod $count 
= 1]">
    <xsl:call-template name="Foo">
        <xsl:with-param name="Bar" select="(.|following::Identifier[$count > 
position()])/../.."/>
    </xsl:call-template>
</xsl:for-each>

If you want to have additional conditions you should put these additional 
predicates after Identifier:
<xsl:for-each 
select=/Products/ProductsItem/Identifiers/Identifier[Type='ECCN Nbr' or 
Type='PO Nbr'][position() mod $count = 1]">
    <xsl:call-template name="Foo">
        <xsl:with-param name="Bar" 
select="(.|following::Identifier[Type='ECCN Nbr' or Type='PO Nbr'][$count > 
position()])/../.."/>
    </xsl:call-template>
</xsl:for-each>

"Ben Schumacher" <bschumacher@i...> wrote in message 
news:OtMX3FCSEHA.2000@T......
> Thanks for the reply!  If you don't mind, I have another question ...
>
> Here is the exact XML structure that I am working with ...
>
> <Products>
>    <ProductsItem>
>        <Product>
>            <PacketData>
>                <Product>
>                    <ProductNbr>1</ProductNbr>
>                    <Description>1 Description</Description>
>                </Product>
>            </PacketData>
>        </Product>
>        <Identifiers>
>            <PacketData>
>                <Identifiers>
>                    <Identifier>
>                        <Type>ECCN Nbr</Type>
>                        <Value>ECCN-1</Value>
>                    </Identifier>
>                    <Identifier>
>                        <Type>PO Nbr</Type>
>                        <Value>PO-1</Value>
>                    </Identifier>
>                    <Identifier>
>                        <Type>SE Nbr</Type>
>                        <Value>SE-1</Value>
>                    </Identifier>
>                </Identifiers>
>            </PacketData>
>        </Identifiers>
>    </ProductsItem>
>    <ProductsItem>
>        <Product>
>            <PacketData>
>                <Product>
>                    <ProductNbr>2</ProductNbr>
>                    <Description>2 Description</Description>
>                </Product>
>            </PacketData>
>        </Product>
>        <Identifiers>
>            <PacketData>
>                <Identifiers>
>                    <Identifier>
>                        <Type>ECCN Nbr</Type>
>                        <Value>ECCN-2</Value>
>                    </Identifier>
>                    <Identifier>
>                        <Type>PO Nbr</Type>
>                        <Value>PO-2</Value>
>                    </Identifier>
>                </Identifiers>
>            </PacketData>
>        </Identifiers>
>    </ProductsItem>
> </Products>
>
> Because this is only a snippet of the actual XML structure, please keep in
> mind that there can be many more repeating 'ProductsItem' nodes along with
> many more repeating child 'Identifier' nodes under each 'ProductsItem' 
> node.
>
> I'm wodering how I can call a template that passes a group of 
> 'ProductsItem'
> nodes as a parameter.  The group of 'ProductsItem' nodes being passed as a
> parameter cannot have a count of child 'Identifier' nodes exceeding X. 
> For
> example, if the count that cannot be exceed is equal to 3, I want the 
> first
> template call to pass the first 'ProductsItem' node as the parameter group
> (this is because the first 'ProductsItem' node has 3 child 'Identifier'
> nodes.  Because I cannot exceed a maximum 3 Identifier nodes per each
> call-template instruction, I would still only want to pass the first
> 'ProductsItem' node if the count of its child 'Identifier' nodes was only 
> 2.
> Passing both 'ProductsItem' nodes would exceed a maximum count of 3
> Identifiers per call-template instruction.).  Then, on the second template
> call the parameter would contain the second 'ProductsItem' node with two
> remaining child 'Identifier' nodes.  Another example would be to set the
> maximum number of 'Identifier' nodes per template call to say 10.  In this
> case, my first and only template call would pass both 'ProductsItem' node
> becuase the combined count of the 'Identifier' nodes is only 5.
>
> I guess what I'm having trouble using the code snippet you provided above
> because I don't know how to pass the first few 'ProductsItem' nodes in one
> template call.  Then, pick up where that last template call left off 
> passing
> the next few 'ProductsItem' nodes as a parameter.  Also, it would be nice 
> to
> qualify the count of 'Identifier' nodes by their corresponding child 
> 'Type'
> node value.  For example, I only want to include in my count
> Identifier[Type='ECCN Nbr' or Type='PO Nbr'].
>
> Thanks so much in advance for any help you can give me ...  I'm definetly
> having some trouble here.
>
> Ben
>
>
>
> "Yan Leshinsky" <yanl@o...> wrote in message
> news:uy%23FlMaREHA.132@T......
>> <xsl:for-each
>> select="/Products/ProductsItem/Identifiers/Identifier[position() mod 3 =
>> 1]">
>>     <xsl:call-template name="Foo">
>>         <xsl:with-param name="Bar" select="(.|following::Identifier[3 >
>> position()])/../.."/>
>>     </xsl:call-template>
>> </xsl:for-each>
>>
>> "Ben Schumacher" <bschumacher@i...> wrote in message
>> news:umi2jwOREHA.3348@T......
>> > Looking at the XML below ...
>> >
>> > <Products>
>> >    <ProductsItem>
>> >        <Identifiers>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>12345</Value>
>> >            </Identifier>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>54321</Value>
>> >            </Identifier>
>> >        </Identifiers>
>> >    </ProductsItem>
>> >    <ProductsItem>
>> >        <Identifiers>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>13245</Value>
>> >            </Identifier>
>> >        </Identifiers>
>> >    </ProductsItem>
>> >    <ProductsItem>
>> >        <Identifiers>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>13245</Value>
>> >            </Identifier>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>14235</Value>
>> >            </Identifier>
>> >            <Identifier>
>> >                <Type>ECCN Nbr</Type>
>> >                <Value>15234</Value>
>> >            </Identifier>
>> >        </Identifiers>
>> >    </ProductsItem>
>> > </Products>
>> >
>> > I'm trying to call a template and pass a parameter equal to a group of
>> > ProductsItem nodes where the count of the combined Identifier child
> nodes
>> > under each ProductsItem node exceeds no more than a count of three. 
>> > For
>> > example, the first matching template call would contain a parameter
>> > holding
>> > the first two ProductsItem nodes because the combined count of the
>> > Identifier nodes under these two ProductsItem nodes equals three.  The
>> > next
>> > call would contain the third positioned (and only the third positioned)
>> > ProductsItem node because that ProductsItem node also has a count of
> three
>> > child Identifier nodes.  Hope this makes sense ...  Any help is greatly
>> > appreciated!
>> >
>> > Ben
>> >
>> >
>>
>>
>
>