Loading local chunks in DOM while parsing a large XML file in SAX (Java)?

It could be done with SAX... But I think the newer StAX (Streaming API for XML) will serve your purpose better. You could create an XMLEventReader and use that to parse your file, detecting which nodes adhere to one of your criteria. For simple path-based selection (not really XPath, but some simple / delimited path) you'd need to maintain a path to your current node by adding entries to a String on new elements or cutting of entries on an end tag.

A boolean flag can suffice to maintain whether you're currently in "relevant mode" or not.

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