Here are the data structures with brief descriptions:
| C_HINTERNET | Individual CURL handler |
| Celements | Metadata information about input or output |
| CHINTERNET | Multiple CURL handlers |
| Ciotype | Not named linked list |
| Clocal_params | Parameter definition to be used for sending parameters to a thread |
| Cmap | KVP linked list |
| Cmaps | Linked list of map pointer |
| CMemoryStruct | Headers storage |
| Cmodule_state | The state for the zoo Python module |
| Cmy_callback | The Ruby method pointer |
| CMyCommand | The command to create a ZooWatcher and add it to the global m_WatcherList |
| Cregistry | Profile registry |
| CSagaWatcher | Observer used to access the ongoing status of a running OTB Application |
| Csemun | Arg for semctl system calls |
| Cservice | Metadata information about a full Service |
| Cservices | Services chained list |
| CSSHCON | |
| CzooLock | The lock structure used by the ZOO-Kernel to ensure atomicity of operations |
| CZooWatcher | Observer used to access the ongoing status of a running OTB Application |