Duplicate entries

[Amir Saad]

I use Xindice 1 on Linux,
I have many XML documents, each contains 100 entry. I think some of these 
entries are repeated, is there any algorithm to be followed to avoid inserting 
repeated entries in the collection?
another question, if I inserted the document X.xml to the collection, can I add 
some entries to the same document in the collection later?
Thanks
Amir Saad
Software Engineer