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|Definitionskos:definition||This document is a deliverable of the OGC Testbed-12. It describes the results of analyzing the Testbed-12 web service implementations.OGC has been developing web service specifications since the OGC Web Mapping Testbed in 1999. In particular, the original OGC Web Map Service specification has been developed during that testbed. 17 years later most current OGC web service standards still follow the general approach that had been developed in 1999 (the capabilities document, the remote procedure call via HTTP paradigm, etc).Over time, the OGC web service approach has been amended and extended in different ways by different OGC standards and profiles. In addition, some of the more flexible mechanisms have been used in practice in different ways by different software vendors or communities. The OGC Web Service Common standard had been a response by OGC to these developments and aimed at maintaining a consistent approach across the different OGC web service standards. However, this effort has been only partially successful for several reasons, including shortcomings in the OWS Common standard, the existence of multiple incompatible OWS Common versions and a reluctance by working groups and communities to introduce incompatible changes to existing service types in order to harmonize. All attempts in recent years to continue the work on OWS Common have not seen much traction. While there seems to be general agreement that the current situation is not optimal and that consistency is desirable, it is unclear how to improve in a way that meets market demands.This document summarizes information about the web service implementations in Testbed-12. It is not and should not be understood as a general analysis or assessment of the OGC web service architecture, but a low-key effort to gain some insights from looking at a significant number of web service implementations and their use in interoperability experiments and demos.During the years since 1999 not only the OGC standards baseline has evolved, but also the Web itself. The W3C has been working on identifying Best Practices for Data on the Web and W3C and OGC are jointly working on extending this with Best Practices for Spatial Data on the Web. The analysis also includes an assessment about the OGC approach to web services with respect to the draft best practices at the time of writing of this report.To the extent possible, we draw conclusions and recommendations from the information that has been gathered. These fall into three categories:Improving the interoperability of OGC web services as they are todaySupport for new requirements in a consistent way across service typesImprovements to the standardization processIn addition, there is also a specific case that does not fit into these general categories.|
|labellabel||Testbed-12 Web Service Implementation Engineering Report|
|Creatorcreator||Johannes Echterhoff, Clemens Portele|
|OGC document typedoctype||Public Engineering Report|