I'm not familiar with how they've done it in PostgreSQL, but DB2 does support XML indexes. You just have to write an XPath statement to represent what is stored in the index. Then you can write an XQuery statement and the query engine will use that index. It's quite fast.
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I'm not familiar with how they've done it in PostgreSQL, but DB2 does support XML indexes. You just have to write an XPath statement to represent what is stored in the index. Then you can write an XQuery statement and the query engine will use that index. It's quite fast.