jiayuasu commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1881564104


##########
format/spec.md:
##########
@@ -205,13 +205,18 @@ Supported primitive types are defined in the table below. 
Primitive types added
 |                  | **`uuid`**         | Universally unique identifiers       
                                    | Should use 16-byte fixed                  
       |
 |                  | **`fixed(L)`**     | Fixed-length byte array of length L  
                                    |                                           
       |
 |                  | **`binary`**       | Arbitrary-length byte array          
                                    |                                           
       |
+| [v3](#version-3) | **`geometry(C)`**  | Geometry features from [OGC – Simple 
feature access](https://portal.ogc.org/files/?artifact_id=25355). Edges 
interpolation is always linear/planar. See [Appendix 
G](#appendix-g-geospatial-notes). Parameterized by crs C [4]. If not specified, 
C is `OGC:CRS84`. |                                                        |

Review Comment:
   The idea here is coming from the OGC Simple Feature spec Section 4.19:
   
   > all geometric attributes described piecewise by straight line or planar 
interpolation between sets of points



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