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CONTEXT.md

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+# Mail Tag Projection
+
+This context describes a mailbox view that groups messages by plus-address tags while retaining one authoritative message and state.
+
+## Language
+
+**Source Maildir**:
+The authoritative Maildir whose messages and shared state are exposed through tag folders.
+_Avoid_: Source directory, original folder
+
+**Plus tag**:
+The complete suffix after the first `+` in a recipient address local-part. A plus tag identifies one flat tag folder.
+_Avoid_: Label, category, nested tag
+
+**Tag folder**:
+A mailbox folder containing projections of every source message carrying its plus tag.
+_Avoid_: Physical folder, copied mailbox
+
+**Tag namespace**:
+The separately mounted Dovecot namespace that contains all generated tag folders.
+_Avoid_: Overlay, destination directory
+
+**Message projection**:
+An appearance of a source message in a tag folder. Multiple projections share the source message's state and lifetime.
+_Avoid_: Copy, duplicate
+
+**Mailbox hierarchy separator**:
+The configured Dovecot namespace character that separates mailbox levels and therefore must be escaped when it occurs inside a flat plus tag.
+_Avoid_: Maildir delimiter, tag separator