Take a look at the implementation of ISearchable in one of the simpler modules which stores multiple records of content - Announcements for example. You will find that the basic pattern is to fetch all of the records of data for that particular ModuleId from the database then loop through the records building a SearchItemInfo object for each record and adding it to the SearchItemInfoCollection which is then returned by the method (GetSearchItems). The trick that you may be missing is that when creating each SearchItemInfo object you will pass in as the "Guid" parameter to the SearchItemInfo constructor a string such as:

"document=" & DocumentID.ToString

representing the querystring parameter/value pair which you module will use to display a particular document.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner