Categorization Questions - Joomla! Forum - community, help and support

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hi,

i have few questions concerning categorization in joomla. i'm porting component joomla , trying find features; far without luck:

1) there way somehow tell joomla in choice of categories particular item categories particular (sub)tree should used/available?

2) handy api function exist returns subcategories given (relative) root-node id? if can't specify particular (relative) root-node, function exist returns entire category tree in parseable form (ie: nested array of nodes or of sort)?

greetings/thanks
r






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