What to do when root element is a list?

Question

Hi,
I've been looking at the PurchaseOrder examples and found them really useful and excellent for making a
start at XML DB. However, Ive run into a stumbling block when trying to use my own data
(but i've used the purchase order example below to make illustrating easier).
The problem is rather than have purchase orders in individual XML files,
i have a single file of a few hundred thousand purchase orders inside a parent tag of <PurchaseOrderList>
I can edit the XSD to add the following:
<xs:element name="PurchaseOrderList" xdb:defaultTable="PURCHORDERLIST" xdb:SQLType="PO_LIST_TYPE">
<xs:complexType>
<xs:sequence>
<xs:element name="PurchaseOrder" type="PurchaseOrderType" minOccurs="0" maxOccurs="unbounded" xdb:SQLCollType="PUR_ORDERS"/>
</xs:sequence>
</xs:complexType>
</xs:element>
And remove the line:
<xs:element name="PurchaseOrder" type="PurchaseOrderType" xdb:defaultTable="PURCHASEORDER"/>
And sure enough, i can now load my <PurchaseOrderList> containing all the Purchase orders.
However, I dont really care about the PurchaseOrderList table, its only there because i dont want to have
to break up the list file into the individual entries. But when i load the data like this, as PurchaseOrder is
no longer the root table, I cant work out how to do simple things like select 1 Purchase order document or add
the unique ID constraint etc. (For instance if you load 100 entries in a list and do a select count from the
PURCHORDERLIST table, you get "1", which is correct, but not what Im after).
So, the essence of my question is if I have to load the data where the parent element is there to hold a list
of the "real" documents, how do i design my xsd and subsequent queries to make querying/indexing/retrieving the
data as easy as possible? Ideally I'd like the PurchaseOrder table back & for it to work in an identical way to that in the examples.....
Sorry if I've missed something very basic, but any help would be very gratefully appreciated...
Lee

Answer 1

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