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  "doctitle": "http://www.idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.4.1.2", 
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  "reference": "http://www.idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.6", 
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  "text": "http://www.idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.4.1.2", 
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}