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+This article describes preferred conventions for packaging resources for [[doomsday_2.0]].
+====== How ZIP files are treated ======
+The engine does not differentiate between regular directories and the contents of ZIP files. In the [[internal_file_system]], ZIP files appear as directories. Their contents can be modified as if they were regular directories/files. This applies to creating/deleting files/subdirectories, and reading/writing files.
+ZIP files with the file name extension **.zip**, **.pk3**, **.pack**, **.addon**, **.box**, **.demo**, **.savegame**, and **.map** are all treated as ZIP files in the file system — their contents can be accessed just like they were regular directories.
+===== Nesting ZIPs =====
+A ZIP file can contain any number of nested ZIP files. They are treated just like every other ZIP file. Note that when accessing a nested ZIP file inside another ZIP file, a copy of the entire nested ZIP file is kept in memory. (Contents of unnested ZIP files are only kept in memory when caching individual decompressed entries.)
+Note that the two cases below are identical from the engine's point of view:
+  - **ZIP containing nested ZIPs:**
+    *  main.box (ZIP)
+      *  sub1.pack (ZIP)
+        *  subsub.pack (ZIP)
+      *  demonstration.demo (ZIP)
+  - **ZIP containing unzipped subdirectories:**
+    *  main.box (ZIP)
+      *  sub1.pack/ (directory)
+        *  subsub.pack/ (directory)
+      *  demonstration.demo/ (directory)
+For performance/memory consumption reasons, one might want to only use an actual ZIP file at the top level.
+====== Resource packaging conventions ======

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