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XML is nowadays a commonly used way for describing and exchanging data. Within the GIS community the OpenGIS Consortium (OGC) recently has published the Geographic Markup Language (GML) as a new specification [8]. GML is essentially an XML encoding of the Simple Feature Specification (SFS). A range of further XML-based standardization efforts by the OGC are under development right now. But it is known that spatial features do not only have geometric or thematic properties, but also temporal aspects. These have been neglected by the OGC and most GIS vendors so far, but have been an active area of research for years. Recently a flexible object-oriented temporal framework for describing 4D-geoobjects has been developed [21]. This temporal framework has been realized in Java and has been implemented on two databases (namely the OODB Jasmine by Computer Associates and the OR DB Cloudscape by Informix). The temporal framework is a self-consistent object-oriented structure to describe temporal data and can easily be represented by an XML schema. This schema can be combined with the existing GML schema to realize a powerful spatio-temporal XML-Schema. The temporal XML schema is being introduced and explained in this paper, and examples using a geo-server are being presented. The latter has been developed for the Deep Map project and implements the SFS for CORBA interfaces [19], as well as it does also support GML.