rdblue commented on code in PR #15630:
URL: https://github.com/apache/iceberg/pull/15630#discussion_r3025112370


##########
format/spec.md:
##########
@@ -1637,6 +1683,31 @@ The binary single-value serialization can be used to 
store the lower and upper b
 
 ## Appendix E: Format version changes
 
+### Version 4
+
+Relative path support is added in v4.
+
+Reading v3 metadata for v4:
+
+* All path fields are treated as absolute paths
+* Table metadata field `location` is always present
+
+Writing v4 metadata:
+
+* Table metadata JSON:
+    * `location` is now optional
+    * When present, `location` must be an absolute path

Review Comment:
   We usually try to keep changes to the same field in a single bullet.



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