This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
Get the base type for this type.
Returns the SDO_Model_Type for the base type if this type inherits from
another, otherwise returns
NULL. An example of when base types occur
is when a type defined in XML schema inherits from another type by using
<extension base="..."> .