topic Re: XPath category queries + ancestor axis in Alfresco Archive

XPath category queries + ancestor axis

dbevacqua — Wed, 02 Aug 2006 14:31:26 GMT

Hi(Apologies in advance - I think this is going to be a long one…)I'm trying to write a generic search interface that allows users to query the repo for nodes of a particular type, specifying criteria about the attributes and categories of ancestors and descendants. I've come up against a few issues

Re: XPath category queries + ancestor axis

dbevacqua — Wed, 02 Aug 2006 16:40:00 GMT

sorry just noticed a typo in the last bit of the above. Should read


all ancestors of                  <– just analyse the nodes returned by Lucene?
   (all nodes of type B in category x)  <– Lucene query
with type A 
   
intersection

all descendants of                   
   (all nodes of type C in category y) <– Lucene query
with type A  
‍‍‍‍‍‍‍‍‍‍‍

Re: XPath category queries + ancestor axis

andy — Thu, 03 Aug 2006 14:25:01 GMT

Hi

You are right, you can not use lucene for this.
We do not do joins or support predicates at the moment.

You should be able to use the ancestor:: axis in XPATH queries - using the default Jaxen implementation.

The XPATH category stuff should have a property that contains the nodeRef of the linked category. Your example should work. There may be an issue with multivalued properties in XPATH searches. I will have a look at this when time allows. Also remember that categories are in a tree so you would have to check for membership of a category and all its sub categories. This si where the lucene stuff will win.

Your suggestion is probably the best way at the moment.

Regards

Andy