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[Option] enableLinkExtraction [Description] 
Sets whether link extraction should occur on document content. Default true. When true, the content of supported parts (e.g. Daisy HTML, navigation, books) are parsed for links. The branches, languages and namespaces used in those links are included in the export as non-required (the registration of these branches, languages and namespaces in the target repository is important for link extraction to work, and in case of the namespaces to make sure they are associated with the correct fingerprint). Setting this to false can save the export tool some work (the export will run a bit faster).
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