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Hi,
to translate the info fields, you can either use the component "babelfish", which works really great for multi-language sites, or (if you only have one language anyway) change the entries in the backend of JCollection directly. What you are looking for is the "info types". Every info type can have up to 10 different fields, so you can add your custom field(s) to the "Movie" type.
The "overwrite thing" is one of JCollection's core feature. It is possible to utilize webservices (such as Amazon(*), Google books, imdb(*),...) to fetch information about an item, and then to "overwrite" the information that is stored in JCollection's database with the information from the webservice (that may be the title, description, actors, whatever). Also, it is possible to "overwrite" the "global" item information with the information that is stored in the first info set, which makes sense if every item consists of only one info set anyway. I've written down some lines about the overwrite in the manual (it's not complete, but should give you the idea).
Finally, if you import a new XML file, the items will be added to the database. I am not 100% sure if JCollection checks for duplicated entries, but I think for the import duplicated titles are ok.
HTH,
Thorsten.
(*) requires some fine-tuning.
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