GeomFromGML (geography Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Constructs a geography instance given a representation in the SQL Server subset of the Geography Markup Language (GML).
For more information on GML, see the following Open Geospatial Consortium Specifications: OGC Specifications, Geography Markup Language
This geography data type method supports FullGlobe instances or spatial instances that are larger than a hemisphere.
Syntax
GeomFromGml ( GML_input, SRID )
Arguments
GML_input
Is an XML input from which the GML will return a value.
SRID
Is an int expression representing the spatial reference ID (SRID) of the geography instance to return.
Return Types
SQL Server return type: geography
CLR return type: SqlGeography
Remarks
This method throws a FormatException if the input is not well-formatted.
This method will throw ArgumentException if the input contains antipodal edge.
Examples
The following example uses GeomFromGml() to create a geography instance.
DECLARE @g geography;
DECLARE @x xml;
SET @x = '<LineString xmlns="http://www.opengis.net/gml"><posList>47.656 -122.36 47.656 -122.343</posList></LineString>';
SET @g = geography::GeomFromGml(@x, 4326);
SELECT @g.ToString();
The following example uses GeomFromGml() to create a FullGlobe``geography instance.
DECLARE @g geography;
DECLARE @x xml;
SET @x = '<FullGlobe xmlns="http://schemas.microsoft.com/sqlserver/2011/geography" />';
SET @g = geography::GeomFromGml(@x, 4326);
SELECT @g.ToString();