I'm wondering what's the best approach to cloning an entire document? Would it be better to keep a master copy in memory and then create a new document and import the other document in there, or would it be better to simply reparse the document every time (where the document is used over and over again as a template, a copy is created and manipulated on each HTTP request, then serialized to the browser)? If I keep the document in memory and know I am dealing with the Xerces2 implementation, can I just call cloneNode(true) and get an identical copy of the whole document, including doctype, entities, entity references, etc...? Again, would this be more efficient than reparsing the document each time with, say, the Xerces2 DOMParser? Is there a clear-cut answer to this, or does it depend on document size or other aspect of the document or environment?
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