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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