Releasing heritage information online is to be encouraged but it is important that any project contemplating this should also look into the issues of access to their data. There are vast amounts of heritage data available online in a format which is of little use for researchers who would like to reuse or interrogate the datasets.
XML could provide a solution to this and combined with Web Services it will allow users to create their own aggregated searches across a number of online datasets. This paper discusses an attempt to develop a deep portal which searches the Swedish Sites and Monuments Record (FMIS) and the ARK system developed by L – P : Archaeology through Web Services and creates a combined output.