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a column in a database table
a field in a form
an element in an XML schema
The definitions, including rules and constraints for valid values for all Data Elements are defined using the following metamodel:
Name: the name of the data element
Description: a description of the data class
Data type: the constraint on the data element e.g. integer, string
Cardinality: the number of times an lement can occur within a group
Level: Could, Should, Must
Metadata: any additional metadata associated with the data element
Relationships: related data classes or elements (which may reside in another standard), including child/parent relationships
Examples
Date of birth
Sex
Blood typeAddress
How do data elements relate to other catalogue elements?
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