class AsGML(expression, version=2, precision=8, **extra) Availability: Oracle, PostGIS, SpatiaLite
class MemSize(expression, **extra) Availability: PostGIS Accepts a single geographic
class Centroid(expression, **extra) Availability: MySQL, PostGIS, Oracle, SpatiaLite Accepts
class Translate(expression, x, y, z=0.0, **extra) Availability: PostGIS, SpatiaLite Accepts
class ForceRHR(expression, **extra) Availability:
class NumGeometries(expression, **extra) Availability: MySQL, PostGIS, Oracle, SpatiaLite Accepts
class SymDifference(expr1, expr2, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
class AsSVG(expression, relative=False, precision=8, **extra) Availability: PostGIS, SpatiaLite
class Union(expr1, expr2, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite Accepts
class GeoHash(expression, precision=None, **extra) Availability: PostGIS, SpatiaLite (≥ 4.0, LWGEOM)
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