(urgent) How to make sumarize query against XMLType?

Question

Hello,
i have xml document like this
<List>
<Item>
<A>10</A>
<B>554</B>
<C>25.5.2005</C>
</Item>
<Item>
<A>20</A>
<B>49</B>
<C>26.5.2005</C>
</Item>
<Item>
<A>30</A>
<B>184</B>
<C>27.5.2005</C>
</Item>
</List>
in xmltype variable (not table column) and i need e.g. sum (or count or something like that) values in xpath /List/Item/B in one document.
Is there some quick and elegant way to do this?
Thanks for quick help.

Answer 1

Maybe the below will help.
Did you look at building a view over the xmltype extracting the values into a relational type view, then using the view to sum up the values.
Jonthan Gennick has an article on the Oracle OTN website with the below code.
CREATE VIEW cd_master (Title, Artist, Website, Description) AS
SELECT extractValue(value(x),'/CD/Title'),
extractValue(value(x),'/CD/Artist'),
extractValue(value(x),'/CD/Website'),
extractValue(value(x),'/CD/Description')
FROM CD331_TAB x;
CREATE INDEX by_artist ON CD331_TAB x (
extractValue(value(x),'/CD/Artist'));
ANALYZE TABLE cd331_tab COMPUTE STATISTICS FOR TABLE;
ANALYZE INDEX by_artist COMPUTE STATISTICS;