MySQL Conformance and Compatibility
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GIS Features That Are Not Yet Implemented
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 one row for each geometry column
     in the database.

Functions to add/drop spatial columns
     OpenGIS assumes that columns can be added or dropped using special
     `AddGeometryColumn()' and `DropGeometryColumn()' functions. In
     MySQL, this is done using the `ALTER TABLE', `CREATE INDEX', and
     `DROP INDEX' statements instead.

Factors related to Spatial Reference Systems and their IDs (SRIDs):
        * Functions like `Length()' and `Area()' assume a planar
          coordinate system.

        * All objects currently are considered to be in the same planar
          coordinate system.


 that calculates the length of string values, and
     sometimes it's not possible to distinguish whether the function is
     called in a textual or spatial context. We need either to solve
     this somehow, or decide on another function name.

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