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| - A semantic type is an ontology expression that is "linked" to a resource using a __semantic annotation__. Generally, the resource in question will have an annotation to a single concept. And optionally, individual "sub-structures" of the resource (e.g., particular attributes of a dataset), will have further annotations (links) into portions of the resource concept. |
| + A semantic type is an ontology expression that is "linked" to a resource using a __semantic annotation__. Generally, a semantically typed resource will have an annotation to a single concept. Plus, additional resource "sub-structure" (e.g., particular attributes of a dataset) annotations may exist that further link portions of the resource to parts of the resource's more general concept (examples are given below). |
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| - Semantic types can be expressed using the following XML representation (see below [3] for the XML Schema). |
| + The following XML representation shows the general form of the canonical semantic type interchange syntx (see below [3] for the XML Schema). |
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| - To be used within the SEEK architecture, semantic types must be uniquely identified. The unique identifier of a semantic type can be |
| - stated using the {{id}} attribute of the {{SemanticType}} element. An identifier is (preferably) expressed as an LSID in which the semantic type is managed as an LSID data object. Alternatively, if a semantic type is embedded within a document, the semantic-type id can be expressed as a fragment identifier (for example, when used within EML). |
| + The element {{semtype}} starts a semantic type definition. A semantic type can have an optional unique identifier, which is given in the {{id}} attribute. Unique identifiers are (preferably) expressed as an LSID, allowing the semantic type to be managed as an LSID data object. Alternatively, if a semantic type is embedded within a document, the semantic-type id can also be expressed as a fragment identifier (for example, when used within EML). |
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| - As shown above, a semantic type consists of a set of labels, a set of annotations, and an optional ontology definition section. The rest of this document describes these components. |
| + As shown above, a semantic type consists of a set of {{resource}} elements, {{ontology}} elements, and {{annotation}}} elements. We consider each of these elements, in turn, below. |
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| - !!! Semantic-Type Labels |
| + !!! Semantic-Type Resource References |
