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| - Labels within a semantic-type description provide a mechanism to identify and name the resources and ontology terms used in the |
| - corresponding annotations. In a {{Label}} element, the the {{name}} attribute is assigned to the resource identified by the {{resource}} attribute. Each {{Label}} element is required to have exactly one {{name}} and {{resource}} attribute. A {{SemanticType}} element must contain at least two {{Label}} elements: one identifying the resource to be annotated and the other identifying an ontology concept. Further, no two {{Label}} elements within a semantic type may have the same {{name}} attribute. |
| + Labels within a semantic-type description provide a mechanism to identify and name resources and ontology terms. Label names are used within annotations to refer to resources and ontology terms. In a {{Label}} element, the {{name}} attribute is assigned to the resource identified by the {{resource}} attribute. Each {{Label}} element is required to have exactly one {{name}} and {{resource}} attribute. A {{SemanticType}} element must contain at least two {{Label}} elements: one identifying the resource to be annotated and the other identifying an ontology concept. Further, no two {{Label}} elements within a semantic type may have the same {{name}} attribute. |
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| - The first label shown below associates a dataset to the name {{crops}} and the second label associates an ontology concept to the name {{Biomass}}. |
| + Two label definitions are shown below. The first label associates a data set to the name {{crops}} and the second label associates an ontology concept to the name {{Biomass}}. |
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| - An annotation asserts that an object of a resource has a particular meaning according to definitions within an ontology. The {{object}} and {{meaning}} attributes of an {{Annotation}} element relate the object and ontology expressions, respectively. We provide a uniform __annotation language__ for identifying resource objects and specifying ontology expressions. |
| + An annotation asserts that an object of a resource has a particular meaning according to an ontology. The {{object}} and {{meaning}} attributes of an {{Annotation}} element relate the object and ontology expressions, respectively. We provide a uniform __annotation language__ for identifying resource objects and for creating corresponding ontology instances. |
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| - Some resources (in particular, data sets and actors with input/output ports) can have complex data structures. For example, a data set typically is structured according to a schema, which specifies among other things a relation name (that is, the name of the table) and names for each attribute of the relation and their data types. Actor ports can also have complex structure, including arbitrarily nested relations. The annotation language facilitates the selection of the various (sub-) objects of structured resources. The entire resource itself can also be selected using the annotation language. |
| + Some resources, such as data sets and actors with input/output ports, can have complex data structures. For example, a data set typically is structured according to a schema, which specifies among other things a relation name (that is, the name of the table) and names for each attribute of the relation and their data types. Actor ports can also have complex structure, including arbitrarily nested relations. The annotation language facilitates the selection of the various (sub-) objects of structured resources. The entire resource itself can also be selected using the annotation language. |
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| - The first atom {{T}} selects corresponding objects of the resource. For example, if the resource is a data set, {{T}} selects the tuple objects of the resource. If the resource is an actor, {{T}} selects instances of the actor. The second atom {{T.A1}} selects {{A1}} objects contained within {{T}} objects. For {{T}} representing a data set, {{T.A1}} selects the values of attribute {{A1}} for tuples of {{T}}. The last atom selects nested attributes for complex structures occuring, for example, in actor input/output ports. For instance, if {{T}} represents an input port to some actor[1], {{T.A1.A2}} selects the {{A2}} objects nested within {{A1}} objects contained in {{T}} objects. Atoms can be combined to form expressions. In particular, an expression is either: (a) a single atom or (b) a comma-separated list of atoms of the form {{T.A1}} or {{T.A1.A2. ... An}}. |
| + The first atom {{T}} selects corresponding objects of the resource. For example, if the resource is a data set, {{T}} selects the tuple objects of the resource. If the resource is an actor, {{T}} selects instances of the actor. The second atom {{T.A1}} selects {{A1}} objects contained within {{T}} objects. For {{T}} representing a data set, {{T.A1}} selects the values of attribute {{A1}} for tuples of {{T}}. The last atom selects nested attributes for complex structures, for example, used by actor input/output ports. For instance, if {{T}} represents an input port to some actor[1], {{T.A1.A2}} selects the {{A2}} objects nested within {{A1}} objects contained in {{T}} objects. |
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| - In the abbreviated syntax, ontology expressions only consist of a single concept label {{C}}. |
| + Atoms can be combined to form expressions. In particular, an expression is either: (1) a single atom or (2) a comma-separated list of atoms of the form {{T.A1}} or {{T.A1.A2. ... An}}. |
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| - To illustrate, consider the following semantic-type description for the {{crops}} data-set resource. |
| + In the abbreviated syntax, ontology expressions only consist of a single concept label {{C}}. |
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| + To illustrate, consider the following semantic-type description for the {{crops}} data set. |
