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This talk introduces to several buzz words appearing in the context of SDI. After detailing some of the better known acronyms they are put into an architectural context and related to the Resource Oriented Architecture (ROA).
The legacy definition of a Spatial Data Infrastructure (SDI) is an infrastructure to provide interactively connected access to spatial data and metadata using software tools. In more recent definitions of SDI it translates into "Spatial Data on the Internet". The main reason for this shift in perspective is that there is no need to define a separate infrastructure for spatial data if a perfectly well organized infrastructre is already in place (the Internet and the Web).
In the last section ROA concepts are mapped to current Web and Internet technologies and a perspective of the evolution of SDI is given.