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There is an example in the testme plugin that does a quick serial parse of the metadata using QuickParser. So no need to use lxml since it need not exist for Python 2.7 plugins. Calling it parses the metadata into text, tag, attribute and contents fields that are simple python data types. But yes you still need to parse it somehow.
The reason behind that is that epub3 metadata refines makes relationships among those entries and across to manifest entries as well. As any interface would need to identify and build up any refines done and map them to the primary entries. So you will need to parse all of the metadata just to get one entry and be sure of having all of its refines.
Thanks for the code snippet. I may modify it and add it to the plugin developer thread to keep it with the gui pieces and things.
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