RFC_WCD_DATA is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "WCM: WCD Header Data Processed by RFC" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_RFC_WCD_DATA TYPE RFC_WCD_DATA.
The RFC_WCD_DATA table consists of various fields, each holding specific information or linking keys about WCM: WCD Header Data Processed by RFC data available in SAP. These include OBJNR (Object number), STXT (Descriptive Short Text), WCTYP (Type of WCM Object), CCTYP (Item Category)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .