The metadata problem
One of the most important missions of SCAM is to serve as a metadata catalogue for learning
resources. The resources themselves may be distributed and referred to by URI:s. One of the
fundamental problems and common misconceptions regarding metadata is that metadata is
objective, static and has logically defined semantics [Nilsson, Palmér, Naeve, 2002]. Since
this is not really true, especially not for learning resources, we need a mechanism for
supporting a metadata ecosystem of dynamically evolving metadata over multiple metadata
sets, using different metadata models, vocabularies and taxonomies for the same set of
resources. We also need a mechanism that provides metadata semantics. In order to address
those problems, we have turned to the Resource Description Framework or RDF4. As Bray
expresses it: “RDF is a framework for describing and interchanging metadata.” [Bray, 2000].
The use of RDF is a good start in order to design a system that has the wanted characteristics.
For this reason, the SCAM metadata implementation is based on the newly released RDF
bindings for LOM/IMS Metadata.6 To describe the structure of learning resources, IMS
Content Packaging is implemented using, an RDF-based version of the IMS Content
Packaging specification. This specification was developed by Mikael Nilsson and Matthias
Palmér7, in order to solve this problem (and others) for the SCAM project as well as for the
Edutella project. Edutella is an RDF based peer-to-peer (P2P) infrastructure for metadata
interchange and interoperability on the semantic web
The metadata problemOne of the most important missions of SCAM is to serve as a metadata catalogue for learningresources. The resources themselves may be distributed and referred to by URI:s. One of thefundamental problems and common misconceptions regarding metadata is that metadata isobjective, static and has logically defined semantics [Nilsson, Palmér, Naeve, 2002]. Sincethis is not really true, especially not for learning resources, we need a mechanism forsupporting a metadata ecosystem of dynamically evolving metadata over multiple metadatasets, using different metadata models, vocabularies and taxonomies for the same set ofresources. We also need a mechanism that provides metadata semantics. In order to addressthose problems, we have turned to the Resource Description Framework or RDF4. As Brayexpresses it: “RDF is a framework for describing and interchanging metadata.” [Bray, 2000].The use of RDF is a good start in order to design a system that has the wanted characteristics.For this reason, the SCAM metadata implementation is based on the newly released RDFbindings for LOM/IMS Metadata.6 To describe the structure of learning resources, IMSContent Packaging is implemented using, an RDF-based version of the IMS ContentPackaging specification. This specification was developed by Mikael Nilsson and MatthiasPalmér7, in order to solve this problem (and others) for the SCAM project as well as for theโครงการ Edutella Edutella เป็นการใช้ RDF เพียร์เพื่อเพียร์ (P2P) โครงสร้างพื้นฐานสำหรับข้อมูลเมตาแลกเปลี่ยนและทำงานร่วมกันบนเว็บเชิงความหมาย
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