The reader and writes are also used by some conversion plugins. Instead of duplicating code I often put the metadata stuff into the reader/writer class and use it in the conversion plugin.
Quote:
Originally Posted by RamZesS
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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You do not need to provide both. It's nice to have both but not aways feasible. As you noted not all formats have both.