Hi Ivan,
Appreciate your quick reply. Thank you.
Best regards,
Prashanth
________________________________
From: Ivan Shcheklein <[email protected]>
To: Prashanth kamath <[email protected]>
Cc: "[email protected]"
<[email protected]>
Sent: Thursday, November 10, 2011 11:41 PM
Subject: Re: [Sedna-discussion] Query on Hierarchical support of Sedna XML DB
Hi Prashanth,
Sedna does not support hierarchical collections, it supports one
>collection deep from the root database and nothing further.
Yep. Database may contain multiple collections (or stand-alone documents). Each
collection may contain multiple documents.
XML:DB API states “An XML database MAY expose collections as
>a hierarchical set of parent and child collections.” What does it mean?
XML:DB API emulates hierarchical collections for Sedna. This is specific for
XML:DB API only.
I have a requirement in which a tree of objects (these objects have relations
with each other ; i.e either parent-child or sibling or just association among
themselves) has to be stored and retrieved and the tree is so several levels
deep. How can I address this requirement through Sedna? Please let me know.
Probably there is some misunderstanding. There are two different kinds of
hierarchies:
1. XML documents natural nesting:
<parent>
> <child>1</child>
> <child>2</child>
></parent>
here we have parent and two child siblings. Sedna as a native XML database
operates with this kind of relations by definition. It works with any XML
document.
2. There are collections to group a bunch of documents into one whole. Consider
this like folder with many files inside. Sedna doesn't allow creating
collections within collections.
An additional query on the same line. Does Sedna provide support for callbacks
on trigger?
Sedna doesn't provides application-level callbacks for triggers.
Ivan Shcheklein,
Sedna Team
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