When some <MetadataWriterPlugin> is used
Can somebody explain me when <MetadataWriterPlugin> is used, in which context or conversion process phase?
Is it possible for a user to call it from UI in order to apply current book metadata to the selected book format?
If I provide <MetadataReaderPlugin> for some book format should I develop the <MetadataWriterPlugin> as well?
(I looked up in the code, it looks like not all build-in book formats have both type of plugins)
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