This document has the following parts:
Conceptual and Usage Information provides conceptual and usage information about Oracle Spatial and Graph.
Spatial Web Services provides conceptual and usage information about Oracle Spatial and Graph web services.
Part III provides reference information about Oracle Spatial and Graph operators, functions, and procedures.
Supplementary Information provides supplementary information (appendixes and a glossary).
To understand the examples in the reference chapters, you must understand the conceptual and data type information in Spatial Data Types and Metadata, especially SDO_GEOMETRY Object Type.