RussellSpitzer commented on code in PR #16025:
URL: https://github.com/apache/iceberg/pull/16025#discussion_r3227416901


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format/spec.md:
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@@ -590,85 +592,182 @@ A data or delete file is associated with a sort order by 
the sort order's id wit
 
 ### Manifests
 
-A manifest is an immutable Avro file that lists data files or delete files, 
along with each file’s partition data tuple, metrics, and tracking information. 
One or more manifest files are used to store a [snapshot](#snapshots), which 
tracks all of the files in a table at some point in time. Manifests are tracked 
by a [manifest list](#manifest-lists) for each table snapshot.
+A manifest is an immutable file that lists data files or delete files, along 
with each file’s partition data, metrics, and tracking information. One or more 
manifest files are used to store a [snapshot](#snapshots), which tracks all of 
the files in a table at some point in time. In V1-V3, manifests are tracked by 
a [manifest list](#manifest-lists) for each table snapshot. In V4, a single 
root manifest per snapshot can directly reference data files, delete files, and 
other data and delete manifests.
 
-A manifest is a valid Iceberg data file: files must use valid Iceberg formats, 
schemas, and column projection.

Review Comment:
   Not sure why we are changing the pluralization here but the change is ok. 
Just wondering because we immediately switch back to singular in the next 
paragraph. 



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