An interesting work trying to find ways to improve the SDI users experience through efficient search capabilities. Below some recommendations that may be useful for a full paper: (1) what are exactly the limits of CSW this work is addressing (only the use of facets, hit highlighting, JSON and simplified query interface, or also other things ?) (2) by the way, in your rationale, please clearly distinguish the limits and the solutions you propose (3) it seems that at one side, your work may lead to the enhancement of the CSW standard itself (by the definition of a standardized application profile), while at the other side it is only about server implementations "best practices" (which does improve the results of the CSW service); the separation of these two aspects has to be made clear and also how they are potentially complementary (obviously the size of an abstract was too short to give the details) (4) a wider state of the art is required: are they other research works in the same area and also consider Change Requests received by working groups related to CSW at the OGC (5) also it has to be made clear what are the kind of metadata inputs that are scanned to build the indexes (are you also considering the service metadata document provided by OGC Table Joining Service ?) (6) finally, it is desirable to position the work benefits in relation to the standization process (a preliminary work to give a solid rationale to help future CSW standard revision).
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