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2.2.1.26.1.1 SRID

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The SRID facet is an Int value. This value corresponds to the System Reference Identifier for the coordinate system that is used. The valid values and their meanings are as defined by the European Petroleum Survey Group (EPSG) [EPSG]. If SRID is not specified, the default value of 0 is assumed, which corresponds to a unitless planar coordinate system without a defined origin.

SRID can also have the special value "variable". This means that the SRID is explicitly stated to vary per entity instance.