Martin Necaský

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Recently, the amount of semantic data available in the Web has increased dramatically. The potential of this vast amount of data is enormous but in most cases it is difficult for users to explore and use this data, especially for those without experience with Semantic Web technologies. Applying information visualization techniques to the Semantic Web helps(More)
Recently XML is the standard format used for the exchange of data between information systems and is also frequently applied as a logical database model. If we use XML as a logical database model we need a conceptual model for the description of its semantics. However, XML as a logical database model has some special characteristics which makes existing(More)
It is frequent in practice that different logical XML schemas representing the same reality from different viewpoints exist. There is also usually a conceptual diagram modeling the reality independently of the viewpoints. It is important to keep the XML schemas and conceptual diagram consistent as they are both utilized for different purposes. In practice,(More)
We propose a new conceptual model for XML data called XSEM as a combination of several approaches in the area of the conceptual modeling for XML. The model divides the conceptual modeling process of XML data to two levels. On the first level, a designer designs an overall non-hierarchical conceptual schema of a domain. On the second level, he or she derives(More)
As approaches to conceptual modeling of XML data become more popular, a need arises to reverse-engineer existing schemas to the conceptual models. They make the management of XML schemas easier as well as provide means for accomplishing integration of various XML data sources. Some methods for reverse-engineering of XML schemas have been proposed and in(More)
The paradigm of publishing governmental data is shifting from data trapped in relational databases, scanned images, or PDF files to open data, or even linked open data, bringing the information consumers (citizens, companies) unrestricted access to the data and enabling an agile information aggregation, which has up to now not been possible. Such(More)