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Re: XSL For-Each Help!
Rusty,
XSLT keys are very useful for this sort of thing.
Declare a key that returns ItemsAsSold elements based on the values
of their Distributor children:
<xsl:key name="items-by-distributor" match="ItemAsSold" use="DistributorCode"/>
(You might need or want to qualify this further by matching only
ItemAsSold elements with the criteria you want:
match="ItemAsSold[CanOrderFlag='true'][CanShipFlag = 'true']".)
Invoking this key with a given value will return the set of all
ItemAsSold elements (or all those with the given attribute values)
whose DistributorCode is that value.
If you simply want a list of the unique DistributorCode values, get
that by selecting all of them and filtering in those whose ItemAsSold
parent is the first ItemAsSold with that value, as retrieved by the
key. We commonly use a test on the generated id of an element (since
it is unique to that element) to determine "node identity" in such cases.
In XPath this looks like:
//DistributorCode[generate-id(parent::ItemAsSold) =
generate-id(key('items-by-distributor',current())[1]) ]
which can be bound to a variable, iterated over or what have you.
Such use of the key() function is, indeed, the core of the "Muenchian
method" of grouping in XSLT 1.0.
This is complex (and non-intuitive) enough that XPath 2.0 cuts the
Gordian knot by providing us a distinct-values() function
distinct-values(//ItemAsSold[CanOrderFlag='true'][CanShipFlag =
'true']/DistributorCode)
which returns a sequence of strings rather than a set of
DistributorCode elements.
I hope this helps,
Wendell
At 03:17 PM 7/17/2006, you wrote:
Hi All,
Please see the below, I am in desperate need to
resolve this issue and cannot figure it out for the
life of me...
----Problem----:
I am trying to obtain a distinct list of
values('DistributorCodes') for each 'Item' from a
large XML file containing thousands of items.
----Needs-----:
I need to store the result in a variable within my
stylesheet in order to satisfy other dependencies
---Sample XML-----:
<Items>
<Item ID="1234">
<ItemsAsMade>
<ItemAsMade>
<SupplierCode>SHO</SupplierCode>
<ItemsAsSold>
<ItemAsSold>
<DistributorCode>MEX</DistributorCode>
<CanOrder>true</CanOrder>
<CanShip>true</CanShip>
</ItemAsSold>
<ItemAsSold>
<DistributorCode>CAN</DistributorCode>
<CanOrder>false</CanOrder>
<CanShip>false</CanShip>
</ItemAsSold>
<ItemAsSold>
<DistributorCode>USA</DistributorCode>
<CanOrder>true</CanOrder>
<CanShip>true</CanShip>
</ItemAsSold>
</ItemsAsSold>
</ItemAsMade>
<ItemAsMade>
<SupplierCode>SHC</SupplierCode>
<ItemsAsSold>
<ItemAsSold>
<DistributorCode>CAN</DistributorCode>
<CanOrder>true</CanOrder>
<CanShip>true</CanShip>
</ItemAsSold>
<ItemAsSold>
<DistributorCode>USA</DistributorCode>
<CanOrder>false</CanOrder>
<CanShip>false</CanShip>
</ItemAsSold>
<ItemAsSold>
<DistributorCode>MEX</DistributorCode>
<CanOrder>false</CanOrder>
<CanShip>false</CanShip>
</ItemAsSold>
</ItemsAsSold>
</ItemAsMade>
</ItemsAsMade>
</Item>
.....lots more Items...
</Items>
-----My Current Stylesheet snippet-----
<xsl:variable name="distributorVal">
<!-- only process distributorCodes if canShip and
canOrder are both true -->
<xsl:for-each
select="//ItemAsMade/ItemsAsSold/ItemAsSold[CanOrderFlag
='true'][CanShipFlag = 'true'][not(DistributorCode =
preceding::DistributorCode)]/DistributorCode">
<xsl:value-of select="."/>
<xsl:text>,</xsl:text>
</xsl:for-each>
</xsl:variable>
---Curent results based on above code------
CAN
---Expected results---------------------
MEX,CAN,USA
---Findings--------------------
It seems that if any second <ItemAsMade> element
within the <ItemsAsMade> has a 'false' value it
overrides the first <ItemAsMade> even if that one is
set to true, where as if either <ItemAsMade> has both
the canorder and canship flags set to true then that
distributor should be extracted.
---Plea for Help--------------------
PLEASE...PLEASE....can any of you UBER Gods of XSL
help me!!
I have been mucking with this for the past week and
cannot figure it out!
Thanks!!
-Rusty
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