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Folder of vocabulary mapping resources at MMI.
Vocabulary Mapping is the process of relating the terms of two or more vocabularies. Different kind of relations can be depicted depending on the system used to represent the vocabularies and the relations. Some examples are:
- Taxonomy relations: Specific and general relations. For example, A is more general than B.
- Tree relations: Parent-children relations A has a leaf B.
- Graphs relations: Node A is connected to Node B
- Thesaurus relations: Narrower-than, broader than, same as, similar-to. A is broader than B
- Conceptual model relations: Class-subclass relations or class-individuals relations. For example, A is superclass of B
The relation representation is also predetermined by the model or system where the mapping is talking place. If the representation mechanism is a table, writing the two terms in the same row, could mean that they are the same. If a graph is used, a line connecting two terms could also represent the "same as" relation. The difficult part of this process is how to represent the relations in a format that a computer program can understand and use (ror example, XML).
To simplify the integration of vocabularies at MMI we use three relations: sameAs, narrowerThan, and broaderThan, and we use OWL as the medium to express both the vocabularies and the mapping relations. Expressing vocabularies (which are originally in different formats) in OWL is called harmonization, which is the step prior to mapping. Mapping exercises and related resources at MMI can be found here.
Mapping of marine vocabularies allows discovery of data sets, especially mapping between Parameter Discovery Vocabularies (PDV) and Parameter Usage Vocabularies (PUV). PDV vocabularies group parameters and do not necessarily have associated units. PUV vocabularies always have units (including dimensionless) and are used to plot the data or to insert in numerical models. The mappings among these terms will be available as web services ( See MMI ontology web services). The following table shows an initial MMI exercise to present relations among these two types of vocabularies:
Relationship among Parameter Usage Vocabularies (PUV) and
Parameter Discovery Vocabularies (PDV)
Posted December 4th, 2007 by luisBer