| Name | Unit | Description |
|---|---|---|
| TColData | SLDataSet | Information about columns - used in TSLDataSet |
| TDBInfo | SLDB | information about attached databases. |
| TIdxField | SLDB | information about every field of index - TIdxInfo. |
| TIdxInfo | SLDB | index information - see TSLDatabase. |
| TRecData | SLDataSet | Cache data for TSLDataSet |
| TRecInfo | SLDataSet | Used for internal buffer in class. |
| TSLCustomFun | SLFunAgr | Base class for functions and aggregations |
| TSLDatabase | SLDB | database component. |
| TSLDataSet | SLDataSet | TDataSet descendant |
| TSLDBOptions | SLDB | options for TSLDatabase. |
| TSLEngine | SLEngine | engine representation |
| TSLFunction | SLFunAgr | Function class component |
| TSLFun_RecNo | SLDataSet | Build-in function that enumerates row number |
| TTblField | SLDB | information about every field of table - TTblInfo. |
| TTblInfo | SLDB | table information. |