Specifying the data to retrieve from a report document
Because a report document contains cached data in the form of result sets, all you do is select the result set or result sets whose data to use in a report design. You must create a data set for each result set.
How to retrieve data from a report document
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In Data Source Selection, select the report document data source to use. Data Set Type displays BIRT Report Document Data Set.
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New BIRT Report Document Data Set displays all the result sets in the report document. These items are organized under Bookmark, Element ID, and Result Set ID.
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Figure 6-8  
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Select the result set that contains the data to use in the report, then choose Finish. Edit Data Set displays the columns in the data set, as shown in Figure 6-9.
Figure 6-9  
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