Extensible Metadata Repository for Information Systems - RUN UNL ...

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To provide evidence that the Metadata Repository complies with the requirements listed in section 3.1, two validation tests were conducted: The SESS tests and the ITDS test. The tests involved the creation of Fragment and Concept definitions (including definition of automatic relations based on content) and loading those Fragments and Concepts in the repository as well as loading a set of Instances and afterwards checking if the relations were successfully captured and the external metadata integrated. 6.1. Space Environment Support System - SESS The Space Environment Support System (SESS) project, previously presented in section 1.2, was developed to monitor space weather and spacecraft phenomenon. In the project, a metadata repository was developed to store and manage metadata. The repository’s information model was also based on MOF and featured the notions of Concepts and Instances represented as XML Schemas and XML documents, respectively. To model all of the domain metadata, a set of Concepts was created and Instances were produced as a result of normal system operation. To test if this Metadata Repository complied with the requirements presented in section 3.1, two tests were made using the content of the SESS project. The first test consisted in the integration of the XML Schemas of SESS’s Concepts and loading of the XML documents; the second required modeling the set of SESS’s Concepts into Fragments and Concepts of this repository and then loading Instances. The list of Concepts used in this validation includes the full list of Concepts that modeled the domain of the project (and are described in Table 6.1) as well as a small set of Concepts that represented technical metadata (depicted in Figure 6.1). Table 6.1 List of Concepts from SESS project Concept Description Instances Ground Base Stations located on the earth that perform S/W measurements using dedicated instruments 28 Ground Station Stations located on the earth that are used for transmitting information to or receiving information from a S/C 4 120
S/C Event Types of temporal occurrences with the S/C during its operating phase, described start time, end time and value. 0 S/C Parameter Types of numeric or textual S/C telemetry measures in time, as functions in time – f(t) 113 S/C Position Types of components of a S/C position in time – f(t) 9 S/W Event Types of temporal S/W occurrences, described by start time, end time and value. 188 S/W Parameter Types of single numeric S/W measures in time – f(t), or multiple component S/W measures in time – f1(t), f2(t), f3(t) 226 S/W Parameter Component Types of component S/W measures in time of a S/W measure – f(t) 174 Space Agency Space Agencies that operate S/C missions 2 Spacecraft Spacecraft that performs S/W measures or belongs to S/C missions 8 Domain concepts are related with each other and those relations are expressed through instance relation elements. In Figure 6.1, the relationships between domain Concepts (as well as the relations with the technical Concepts) are depicted. 121
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Universidade Nova de Lisboa Faculda
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Abstract Information Systems are, u
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Index Chapter 1 Introduction ......
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6.1.2. Reusability Test ...........
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Figure 4.16 Concept structure defin
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Table Index Table 5.1 Table of docu
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This chapter presents the motivatio
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source community and the commercial
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Non-promotion of Concept reuse is a
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In this chapter the state of metada
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2.2. XML Technologies XML (eXtensib
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eXtensible Style-sheet Language Tra
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• “Upward partial understanding
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2.3.1. RDF The Resource Description
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From the previous example, the W3C
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Knowledge Management within organiz
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ontology, process the data taking i
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these documents in collections. DSp
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Protégé-Frames supplies a graphic
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Figure 2.9 Fedora's online catalog
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using XML Schema (with optional use
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Figure 2.13 Relationship syntax in
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The MDR has some extensibility issu
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This chapter presents the architect
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Reusability (8) - The repository sh
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Figure 3.3 M0 Layer - External Enti
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Starting with time t0 (in Figure 3.
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Figure 3.10 Instance Relation with
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Fragments can be used by Concepts t
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Figure 3.13 Automatic Relation base
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3.7. M3 Layer - Meta-meta-model The
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This chapter presents the design of
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Instances, XML Schema was the choic
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which is required, that it will wra
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Figure 4.7 Structure of the Schema
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Figure 4.10 Use of Constant Annotat
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Figure 4.13 Generic Structure of a
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Schematron Validations Schematron i
Page 86 and 87: Figure 4.21 XSLList element syntax
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Page 92 and 93: Figure 4.34 Syntax for constant ann
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Page 96 and 97: Figure 4.35 summarizes the behavior
Page 98 and 99: Using the repository’s web servic
Page 100 and 101: Figure 4.41 Regular transforming pr
Page 103 and 104: Chapter 5 Implementation This chapt
Page 105 and 106: 5.2.1. High Level Architecture The
Page 107 and 108: • Multi-platform • Provide an U
Page 109 and 110: Berkeley DBXML uses several optimiz
Page 111 and 112: Evaluation The benchmark was run on
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Page 115 and 116: The test consisted in loading a set
Page 117 and 118: 5.4. Storage Model In order to supp
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Page 121 and 122: The document’s root node is the I
Page 123 and 124: Figure 5.14 Storage Model's access
Page 125 and 126: Schematron, that uses the XSLT impl
Page 127 and 128: The previous figure depicts the man
Page 129 and 130: Figure 5.20 XQuery example XQuery e
Page 131 and 132: 5.6.1. Repository Built-in XQuery F
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Page 138 and 139: Figure 6.1 SESS domain concepts rel
Page 140 and 141: Figure 6.3 Definition of Concept Gr
Page 142 and 143: Figure 6.5 Relations between Concep
Page 144 and 145: Concept (marked in area 4 and the s
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Page 149 and 150: Chapter 7 Conclusions and Future Wo
Page 151 and 152: and can be linked to XSLTs or XSLT
Page 153 and 154: References 1. Martins, R.F., Extens
Page 155 and 156: 63. SPARQL Query Language for RDF.
Page 157: 117. Srivastava, A.V., Comparison a
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