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由 Tom Lane 提交于
in whichever context happens to be current during a call of an xml.c function, use a dedicated context that will not go away until we explicitly delete it (which we do at transaction end or subtransaction abort). This makes recovery after an error much simpler --- we don't have to individually delete the data structures created by libxml. Also, we need to initialize and cleanup libxml only once per transaction (if there's no error) instead of once per function call, so it should be a bit faster. We'll need to keep an eye out for intra-transaction memory leaks, though. Alvaro and Tom.
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