[SCM] PostGIS branch master updated. 3.6.0beta1-16-g523c7a6f0

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- Log -----------------------------------------------------------------
commit 523c7a6f08ce79495f0e4c403615b3fd88e12430
Author: Paul Ramsey <pramsey at cleverelephant.ca>
Date:   Thu Aug 7 09:44:28 2025 -0700

    Add a section on handling empty geometry in WKB

diff --git a/doc/ZMSgeoms.txt b/doc/ZMSgeoms.txt
index 33e8778cb..0276f6b1d 100644
--- a/doc/ZMSgeoms.txt
+++ b/doc/ZMSgeoms.txt
@@ -24,6 +24,7 @@ This document defines how geometry can have Z,M or both values and SRID
 in a way which is compatible to the existing 2D OpenGIS Simple Features
 specification AND to the Z-Geometry documented in OpenGIS 99-402r2.
 
+
 2. Proposal
 
 2.1. Definition of ZM-Geometry
@@ -39,6 +40,7 @@ Z and M values. The resulting 2D geometry is the "shadow" of the ZM-Geometry.
 2D geometries cannot be safely converted into ZM-Geometries, since their Z
 and M values are undefined, and not necessarily zero.
 
+
 2.2. Extensions to Well-Known-Binary format
 
 The 2d OpenGIS Simple Features specification has the following geometry types:
@@ -170,7 +172,14 @@ WKBPoint {
 }
 
 
-2.3. Extensions to Well-Known-Text format
+2.3. Empty Geometry Handling
+
+For geometries with a counter (nPoints for LineString, nRings for Polygon, nPoints for MultiPoint, nLines for MultiLineString, nPolygons for MultiPolygon, nGeometries for GeometryCollection), an Empty geometry can be represented by setting the counter to zero.
+
+For an empty Point, which does not have a counter, an empty geometry is signalled by setting all coordinates to an IEEE-754 quiet NaN value (big endian 0x7ff8000000000000 or little endian 0x000000000000f87f depending on the endian value of the WKB).
+
+
+2.4. Extensions to Well-Known-Text format
 
 Geometry SRID presence and value would be represented using a
 "SRID=#;" prefix to the WKT text:

-----------------------------------------------------------------------

Summary of changes:
 doc/ZMSgeoms.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)


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