The Open Geospatial Consortium (OGC) have approved the first version of the OpenGIS® Web Processing Service (WPS) Interface Standard, which defines a standard for publishing, discovery and binding to geospatial processes. This means that there is standards based way for defining a web services interface for geospatial processing, such as creating a buffer, conducting a trace, or finding a shortest path.
I believe there are several open source implementations of WPS already including a Python one PyWPS and a Java version Java WPS .

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