The QuerySource object is most versatile properties in ISYS:web.dk (admin). QuerySource can take a multitude of different data and object values to execute the search.
The following table indicates the resulting query source for each data type:
| Data Type | Resulting Query |
| string | Semicolon separated list of indexes to search |
| long | Searches within the documents contained in the result list |
| ISYSIndex | Searches the ISYSIndex |
| ISYSResultList | Searches within the documents contained in the result list |
| ISYSConceptNode | Searches within the results of the concept node |