The Typological Database System (TDS) is a collection of independently developed typological databases. Unified querying is supported with the help of an integrated ontology. The component databases of the TDS are cross-linguistic databases used for research in language typology and linguistics. They add up to some 1200 different descriptive properties, about more than 1000 languages. (Because of the heterogeneous nature of the collection, most properties are only filled for a fraction of the languages). Most of the data is in the form of high-level "analytical" properties, but there are also a few collections of example sentences (with glosses) illustrating particular phenomena.