Heirarchical data model for Ontology???Help?

I am attempting to model an ontology which is purely heirarchical onto Oracle's relational database.
This can be done with a single table and a recursive foreign key, however I am concerned about the retrieval process having to repetatively query the child rows, then the grandchildren etc.
This is going to be a very large database and I am concerned about performance.
Certainly this is being done at numerous search sites on the web, and yet I cannot find any info on the subject from Oracle.
Thanks for any help at all
null

Hah! I just work it out, share it with someone face the problem like me and hope that will be helpful,
add text() after the XPath you set to get the Element data that you need, like that getLboMappingInfoResponse/result/text(); than it will get the data as XML Format for BI.
Edited by: Weibing.Xia on 2013-5-16 下午5:31

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rp0428,
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> And his design:
>
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>
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>
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