class GeoHash(expression, precision=None, **extra) Availability: PostGIS, SpatiaLite (≥ 4.0, LWGEOM)
class Difference(expr1, expr2, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
class Distance(expr1, expr2, spheroid=None, **extra) Availability: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
class AsKML(expression, precision=8, **extra) Availability: PostGIS, SpatiaLite Accepts
class Area(expression, **extra) Availability: MySQL, Oracle, PostGIS, SpatiaLite Accepts
class SnapToGrid(expression, *args, **extra) Availability: PostGIS, SpatiaLite (≥ 3.1) Accepts
class Envelope(expression, **extra) Availability: MySQL, PostGIS, SpatiaLite Accepts
class Reverse(expression, **extra) Availability: PostGIS, Oracle, SpatiaLite (≥ 4.0) Accepts
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