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The scope of the Standard Vocabulary is stated in the charter of the WG (IVOA EXEC, 17 May 2006). You can read there:
1. User requirements:
"... In the same period of time (i.e. 2005), other WGs realized the need to interact with our WG in order to standardise the vocabulary used to describe the data they were working on (e.g.: DM/SSAP, VOEvents/VOConcepts).
The request (implicit at the beginning) was to expand and generalize the work done on UCDs, and so update our task into the definition of a standard vocabulary in the fields covered by IVOA activities."
2. How to proceed to fulfil the requirements:
"... The main activity of the Semantics WG will be to define the basic elements of a Standard Vocabulary (SV) in all the fields covered by IVOA activities. Starting from already available lists of astronomical words, objects, or concepts (the old thesaurus, keywords used in Journals, and the actual text of scientific papers), we will try to define the basic concepts (processes, instruments, methods, object types, etc.), the instances of these concepts, and possibly the relationships among them.
The concepts will be described using a syntax similar to that already used for UCDs.
This work will be done in collaboration with those IVOA WGs more closely interested in the outcome (and possible rapid application) of this semantic effort."
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