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IMS Vocabulary Definition Exchange - Overview
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These contents have been obtained from the IMS Global Learning Consortium official Web site and edited for presentation. Please refer to the IMS Global Learning Consortium official Web site for additional information on terms of use.
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IMS Global Learning Consortium
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The IMS Vocabulary Definition Exchange (VDEX) specification defines a grammar for the exchange of value lists of various classes: collections often denoted "vocabulary". Specifically, VDEX defines a grammar for the exchange of simple machine-readable lists of values, or terms, together with information that may aid a human being in understanding the meaning or applicability of the various terms. VDEX may be used to express valid data for use in instances of IEEE LOM, IMS Metadata, IMS Learner Information Package and ADL SCORM, etc, for example. In these cases, the terms are often not human language words or phrases but more abstract tokens. VDEX can also express strictly hierarchical schemes in a compact manner while allowing for more loose networks of relationship to be expressed if required.
IMS Vocabulary Definition Exchange Specification Web Page |
Terms of use
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These contents have been obtained from the IMS Global Learning Consortium official Web site and edited for presentation. Please refer to the IMS Global Learning Consortium official Web site for additional information on terms of use.
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The IMS Vocabulary Definition Exchange (VDEX) specification defines a grammar for the expression of value lists of various classes: collections often denoted "vocabulary".
VDEX does not seek to permit the expression of all possible vocabularies: rather to permit the light-weight expression of relatively simple value lists. Furthermore, VDEX is not a modelling language for vocabularies; there may be some properties of a term of interest to the vocabulary creator, an expert in a domain, but that are not required by the end user.
VDEX does permit the expression of simple machine-readable lists of human language terms together with information that may aid a human being in understanding the meaning or applicability of the various terms. Collections of such human language terms are often collected in the form of thesauri; VDEX enables thesauri to be expressed using arbitrary relationship types, inclusive of those specified in ISO 2788 and ISO 5964 standards.
VDEX may be also used to express valid data for use in instances of, for example: IEEE LOM, IMS Meta-Data, IMS Learner Information Package, ADL SCORM. In these specifications, the elements using value lists are often described as being of "vocabulary data type" and expressed through separate domain and value identifiers. The permitted values are formally codes to identify a concept and they may not be always be textually identical to human language terms.
Whereas vocabulary data types typically have an associated unstructured list of terms, meta-data schemas often permit the expression of subject classifications from hierarchical vocabularies (taxonomies), for example Dewey Decimal (DDC) and specialist schemes such as the Medical Subject Headings (MeSH). VDEX can express strictly hierarchical schemes in a compact manner and allows for more loose networks of relationship to be expressed if required.
Polyhierarchical schemes and facetted schemes, such as Universal Decimal Classification (UDC), may not be directly expressed within the VDEX information model although VDEX could be applied by using techniques such as:
- Defining a custom set of relationship types and using the VDEX model
- Using VDEX along side certain working practices
- Extending the VDEX model
- Embedding VDEX within a more elaborate model
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Terms of use
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These contents have been obtained from the IMS Global Learning Consortium official Web site and edited for presentation. Please refer to the IMS Global Learning Consortium official Web site for additional information on terms of use.
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Title: IMS Vocabulary Definition Exchange Information Model
Version: 1.0
Release Date: 4 August 2003
Editors: Adam Cooper, Mark Norton
Status: Public Draft
Electronic version: This version of the IMS Vocabulary Definition Exchange specification is composed of four documents:- IMS Vocabulary Definition Exchange Information Model (HTML).
- IMS Vocabulary Definition Exchange XML Binding (HTML).
- IMS Vocabulary Definition Exchange Best Practice and Implementation Guide (HTML).
- IMS Vocabulary Definition Exchange Conformance Requirements (HTML).
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Terms of use
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These contents have been obtained from the IMS Global Learning Consortium official Web site and edited for presentation. Please refer to the IMS Global Learning Consortium official Web site for additional information on terms of use.
Print
| VDEX may be also used to express valid data for use in instances of, for example: IEEE LOM, IMS Meta-Data, IMS Learner Information Package, ADL SCORM |
Terms of use
X
These contents have been obtained from the IMS Global Learning Consortium official Web site and edited for presentation. Please refer to the IMS Global Learning Consortium official Web site for additional information on terms of use.
Print
| IMS/GLC regularly conducts Summits in conjunction with our Quarterly Meetings. The public is invited to attend these meetings. Presentations and information about past Summits can be accessed here. |
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