Distributed Geospatial applications, built using standards-based services, are currently deployed on top of Geospatial Information Infrastructures. This has increased the range of distributed geospatial content, services, and applications publicly available in Internet. Although standardization of services and components increases interoperability, the distribution of resources makes their discovery a complex task. There are many aspects to be considered in order to improve the discovery of geospatial resources. For instance, resource descriptions are a crucial aspect: content providers may choose to provide standard metadata elements, annotations, simple user tags, and also choose which formats to use to represent these descriptions....
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