Abstract: The conception of fuzzy spatiotemporal data queries was discussed. Fuzzy temporal queries， spatial queries， attribute queries， and spatiotemporal queries of fuzzy spatiotemporal data were studied. A symbolic notation for fuzzy spatiotemporal data queries was proposed on the basis of XQuery. The typical queries were shown by examples and explanations. In addition， the fuzzy spatiotemporal extensions of XQuery were discussed， including extensions of representation， extensions of management， and extensions of architecture. Queries in STQL and FTL could be represented using the proposed symbolic notation. What’s more， semantic confusion caused by different forms of spatiotemporal query representation could be eliminated， and a uniform representation of various types of queries on fuzzy spatiotemporal data could be obtained.

Key words: fuzzy spatiotemporal data, query language, XQuery, FLWOR syntax, symbolic notation