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Ontology Based Information Extraction from the Web
Buba, Vojtěch ; Bartík, Vladimír (referee) ; Burget, Radek (advisor)
The main aim of this thesis is an extraction of information from web based on conceptual modeling with ontology. The main goal of this thesis in question is implementation of a tool, which process input ontology and enable additional editing through graphical user interface. Readers of this thesis will be introduced with languages for writing ontologies, for example RDF, RDFS or OWL. Two extraction methods which use ontologies to describe extracted informations are also explained. Final solution is designed to consider all needs of extraction task defined by Ing. Radek Burget Ph.D. Output of this tool is definition of extraction task compatible with solution FITLayout, being developed at FIT BUT.
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Vzájemný převod mezi XSEM PSM diagramy a jazykem Schematron
Benda, Soběslav ; Klímek, Jakub (advisor) ; Nečaský, Martin (referee)
In the present work we study possibilities in the area of automatic construction of Schematron schemas from a conceptual model for XML and possibilities in reverse-engineering of Schematron schemas. The work introduces the reader to conceptual schemas for XML and to rule-based validation of XML documents. Existing techniques for mutual conversions between XML schema languages and conceptual model are also included. The main part of the work is a design and implementation of a new method for deriving Schematron schemas from conceptual schemas for XML. This method allows to get XML schemas, which in some respects outperforms the possibilities of other popular schema languages.The work also discusses the issue of Schematron schema reverse-engineering and shows possibilities in the area and establishing basis for further research.
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Profiling translation of conceptual schemas to XML schemas
Berka, Lukáš ; Nečaský, Martin (advisor) ; Holubová, Irena (referee)
In the present work we analyze the algorithm that was introduced in [4]. The algorithm performs a translation of a conceptual schema to an XML schema expressed in the XML Schema language. We look for limitations of the algorithm and try to discover parameters that can be potentially used to influence its behavior. We propose solutions to the most serious limitations. Also, we introduce a concept of a translation profiling. The concept is based on a configuration that contains a set of parameters. We modify the algorithm to use the user requirements specified in the configuration. Thanks to the improvements, the new algorithm works with the concept of XML Namespaces, uses XML Schema designs and also, focuses on an elimination of redundancy. The elimination of redundancy in an output of the algorithm is an important part of this work and we create a formal model that helps us to solve this task.
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XML Formats Evolution and Integration
Klímek, Jakub ; Nečaský, Martin (advisor) ; Klettke, Meike (referee) ; Svátek, Vojtěch (referee)
In the past decade XML became a wide-spread information exchange data model. Many XML users have many XML formats described by XML schemas. To ease the management of multiple XML schemas modeling similar reality, the conceptual model for XML was defined. With its definition came various challenges that needed to be further researched. This thesis focuses on two of those challenges. The first challenge is to manage the evolution of the multi-level conceptual model as the modeled reality, XML schemas and applications evolve in time. The second challenge is to allow the majority of users who already use XML schemas in their system without the conceptual model to use their schemas to semi-automatically create one. In addition a step towards integration of the conceptual modeling of XML and semantic web techniques was taken.
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Ontology Based Information Extraction from the Web
Buba, Vojtěch ; Bartík, Vladimír (referee) ; Burget, Radek (advisor)
The main aim of this thesis is an extraction of information from web based on conceptual modeling with ontology. The main goal of this thesis in question is implementation of a tool, which process input ontology and enable additional editing through graphical user interface. Readers of this thesis will be introduced with languages for writing ontologies, for example RDF, RDFS or OWL. Two extraction methods which use ontologies to describe extracted informations are also explained. Final solution is designed to consider all needs of extraction task defined by Ing. Radek Burget Ph.D. Output of this tool is definition of extraction task compatible with solution FITLayout, being developed at FIT BUT.
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Validation of XML documents against XSEM PSM schemas
Skalický, Jakub ; Malý, Jakub (advisor) ; Bednárek, David (referee)
XSEM is a modeling language created for modeling XML schemas. Its implementation, called eXolutio, provides a user friendly interface for modeling schemas in XSEM. The aim of this work is to design an algorithm for validation of XML documents against XSEM PSM schemas and comparison of the expressive power of XSEM PSM with other XML schema languages. The thesis contains the description of fundamental algorithm and all the extensions required to fully support all the constructs and capabilities provided by XSEM. The practical part describes the implementation of the proposed algorithm as an extension of eXolutio.
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XML Formats Evolution and Integration
Klímek, Jakub ; Nečaský, Martin (advisor) ; Klettke, Meike (referee) ; Svátek, Vojtěch (referee)
In the past decade XML became a wide-spread information exchange data model. Many XML users have many XML formats described by XML schemas. To ease the management of multiple XML schemas modeling similar reality, the conceptual model for XML was defined. With its definition came various challenges that needed to be further researched. This thesis focuses on two of those challenges. The first challenge is to manage the evolution of the multi-level conceptual model as the modeled reality, XML schemas and applications evolve in time. The second challenge is to allow the majority of users who already use XML schemas in their system without the conceptual model to use their schemas to semi-automatically create one. In addition a step towards integration of the conceptual modeling of XML and semantic web techniques was taken.
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Vzájemný převod mezi XSEM PSM diagramy a jazykem Schematron
Benda, Soběslav ; Klímek, Jakub (advisor) ; Nečaský, Martin (referee)
In the present work we study possibilities in the area of automatic construction of Schematron schemas from a conceptual model for XML and possibilities in reverse-engineering of Schematron schemas. The work introduces the reader to conceptual schemas for XML and to rule-based validation of XML documents. Existing techniques for mutual conversions between XML schema languages and conceptual model are also included. The main part of the work is a design and implementation of a new method for deriving Schematron schemas from conceptual schemas for XML. This method allows to get XML schemas, which in some respects outperforms the possibilities of other popular schema languages.The work also discusses the issue of Schematron schema reverse-engineering and shows possibilities in the area and establishing basis for further research.
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Profiling translation of conceptual schemas to XML schemas
Berka, Lukáš ; Nečaský, Martin (advisor) ; Holubová, Irena (referee)
In the present work we analyze the algorithm that was introduced in [4]. The algorithm performs a translation of a conceptual schema to an XML schema expressed in the XML Schema language. We look for limitations of the algorithm and try to discover parameters that can be potentially used to influence its behavior. We propose solutions to the most serious limitations. Also, we introduce a concept of a translation profiling. The concept is based on a configuration that contains a set of parameters. We modify the algorithm to use the user requirements specified in the configuration. Thanks to the improvements, the new algorithm works with the concept of XML Namespaces, uses XML Schema designs and also, focuses on an elimination of redundancy. The elimination of redundancy in an output of the algorithm is an important part of this work and we create a formal model that helps us to solve this task.
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Modelování událostí na sémantickém webu
Hanzal, Tomáš ; Svátek, Vojtěch (advisor) ; Vacura, Miroslav (referee)
There are many ontologies and datasets on the semantic web that mention events. Events are important in our perception of the world and in our descriptions of it, therefore also on the semantic web. There is however not one best way to model them. This is connected to the fact that even the question what events are can be approached in different ways. Our aim is to better understand how events are represented on the semantic web and how it could be improved. To this end we first turn to the ways events are treated in philosophy and in foundational ontologies. We ask questions such as what sorts of things we call events, what ontological status we assign to events and if and how can events be distinguished from other entities such as situations. Then we move on to an empirical analysis of particular semantic web ontologies for events. In this analysis we find what kinds of things are usually called events on the semantic web (and what kinds of events there are). We use the findings from the philosophy of events to critically assess these ontologies, show their problems and indicate possible paths to their solution.
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