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With meta-data, we identify all data that surrounds a slide, but that is not graphical. The actual pixels (or viewport representation) of a slide are not meta-data. Annotations can be considered meta-data in the semantic sense, but they're link to graphical activities as well. So annotations are discussed elsewhere in this manual.
There is a blog article that serves as a complementary tutorial to this blog entry. In the article, we consider 3 types of meta-data in PMA.core:
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