Comingling relational and XML data

I have a table that consists of a few keys and an XML fragment. I need to decompose that xml fragment and load it into a new table, with one row for each XML node. The XML node needs to be broken into 2 columns. That's the easy part. For each row of the XML data in the new table, I also need to populate the column with the keys from the original table. I have been unable to find a way to do this without a very slow cursor going through each row in the source table and inserting each node along with its keys into the destination table.

Example of a row in the source table:

IsntanceID            PatientID           EncounterID        XMLData
12867                   46                    63481                 (XML Fragment stored in this column shown below)

XML Fragment:
<finding>
  <item id="314" sectionname="HistoryofPresentIllnessSection" />
</finding>
<finding>
  <item id="353" sectionname="HistoryofPresentIllnessSection" />
</finding>
<finding>
  <item id="341" sectionname="HistoryofPresentIllnessSection" />
</finding>
<finding>
  <item id="650" sectionname="HistoryofPresentIllnessSection" />
</finding>
<finding>
  <item id="1613" sectionname="ChiefComplaintSection" />
</finding>
<finding>
  <item id="663" sectionname="ChiefComplaintSection" />
</finding>


So once transformed, this would end up with 6 rows in the destination table, looking like the following:

IsntanceID            PatientID           EncounterID        id                 sectionname
12867                   46                    63481                 314              HistoryofPresentIllnessSection
12867                   46                    63481                 353              HistoryofPresentIllnessSection
12867                   46                    63481                 341             HistoryofPresentIllnessSection
12867                   46                    63481                 650             HistoryofPresentIllnessSection
12867                   46                    63481                 1613           ChiefComplaintSection
12867                   46                    63481                 663             ChiefComplaintSection
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