class Transform(expression, srid, **extra) Availability: PostGIS, Oracle, SpatiaLite Accepts
class Centroid(expression, **extra) Availability: MySQL, PostGIS, Oracle, SpatiaLite Accepts
class MemSize(expression, **extra) Availability: PostGIS Accepts a single geographic
class NumGeometries(expression, **extra) Availability: MySQL, PostGIS, Oracle, SpatiaLite Accepts
class Length(expression, spheroid=True, **extra) Availability: MySQL, Oracle, PostGIS, SpatiaLite
class ForceRHR(expression, **extra) Availability:
class AsSVG(expression, relative=False, precision=8, **extra) Availability: PostGIS, SpatiaLite
class SymDifference(expr1, expr2, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
class Union(expr1, expr2, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite Accepts
class PointOnSurface(expression, **extra) Availability: PostGIS, Oracle, SpatiaLite Accepts
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