An entity is a reusable fragment of the document content that can be reused multiple times by reference.
Unlike other editors, Serna allows you to edit entity references in-place and shows them as regular content.
There are two types of entities:
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An internal entity can be reused only in the document in which it was declared.
Figure 1. Internal entity in the Editing Window and ContentMap.
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An external entity is saved to a separate file and can be reused in any document.
Figure 2. External entity in the Editing Window and ContentMap.
