rdblue commented on code in PR #17198:
URL: https://github.com/apache/iceberg/pull/17198#discussion_r3786792694


##########
format/spec.md:
##########
@@ -674,11 +674,13 @@ A manifest file must store the partition spec and other 
metadata as properties i
     | _optional_ | _required_ | `format-version`    | Table format version 
number of the manifest as a string                                              
                                       |
     |            | _required_ | `content`           | Type of content files 
tracked by the manifest: "data" or "deletes"                                    
                                      |
 
-The schema of a manifest file is defined by the `manifest_entry` struct, 
described in the following section.
+#### Content file uniqueness
+
+Within a snapshot, each content file must be referenced by at most one 
manifest entry across all manifests; otherwise, the snapshot has undefined 
behavior. Writers are not required to validate uniqueness at commit time.

Review Comment:
   At most one **live** entry?



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