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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
R-Tree Index User's GuideThe Informix® R-Tree Index User's Guide describes the HCL Informix® R-tree secondary access method and how to access and use its components.
Develop DataBlade® modules that use the R-tree secondary access method
Design a user-defined data type
Data objects and bounding boxes
Internal C structure for the user-defined data type

Internal C structure for the user-defined data type

In summary, although the internal C structure for the user-defined data type can be anything the developer wants it to be, the following two rules must be true if columns of this data type are to be indexed with the R-tree access method:

The data structure must support both the actual data object and its bounding box.
Only one C data structure can be defined for the internal representation of the user-defined data.
The same data structure must be passed to all functions that accept the user-defined data type as an argument. Examples of such functions are the support and strategy functions that maintain the R-tree index.

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