XMLDB: Almost working

Question

This is going to be great stuff once the bugs are worked out. 8)
Given a simple table:
CREATE TABLE MY_DOCUMENTS (
ID NUMBER,
CONTENT XMLTYPE
Can anyone explain to me why:
SELECT CONTENT.getStringVal()
FROM MY_DOCUMENTS;
...gives me:
ORA-00904: "CONTENT"."GETSTRINGVAL": invalid identifier
...but adding a table alias:
SELECT foo.CONTENT.getStringVal()
FROM MY_DOCUMENTS foo;
..works fine?
Second, I have the following XML view:
create or replace view balancesheet_asset as
select value(asset).extract('/Asset/AssetType/text()').getStringVal() Asset_Type,
value(asset).extract('/Asset/AssetDescription/text()').getStringVal() Asset_Description,
value(asset).extract('/Asset/AssetValue/text()').getNumberVal() Asset_Value,
value(asset).extract('/Asset/AssetExempt/text()').getStringVal() Asset_Exempt,
value(asset).extract('/Asset/SecuredAmount/text()').getNumberVal() Secured_Amount,
value(asset).extract('/Asset/EstimatedRealizableValue/text()').getNumberVal() Estimated_Realizable_Value
from balance_Sheet x,
table(xmlsequence(x.content.extract('/mns:BalanceSheet/mns:Asset', 'xmlns:mns=http://www.my.org/myNamespace'))) asset;
select * from balancesheet_asset
order by Asset_Value;
... works fine but...
select * from balancesheet_asset
order by Asset_Value desc;
blows up with:
ORA-22806: not an object or REF
I also notice that the XMLSEQUENCE function seems to strip out the namespace information.
We're running 9.2.0.2.0 on Solaris

Answer 1

Questions related to XML DB should be posted in the Products->Database-> XML DB forum.... THis is the forum montored by Oracle XML DB product management and development....
XMLType is implimented as a object type. The SQL standard requires the use of a table alias when invoking methods on an object type.
You need to add the nampespace info into the extract.
Also, try usign the extractValue operators
eg extractValue(asset,'/Asset....) instead of value(asset).extract...