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Introduction
A Data Type is the constraint on a column or a simple type in an xsd or a set of enumerations in a form etc.
Every data element should be constrained by a data type.
There are a number of different types:
Primitives, include types such as an integer, long, string, varchar etc.
- They can include additional validation such as a regular expression or custom java / groovy code
- They do not have a measurement unit
The following types are primitive types (taken from wc3 xsd spec) and should come preloaded in the catalogue.
- string
- boolean
- decimal
- float
- double
- duration
- dateTime
- time
- date
- gYearMonth
- gYear
- gDay
- gMonth
- hexBinary
- base64Binary
- anyURI
For Example:
Note:
1) Name, ID, Version and Description
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4) Other data types that use this as a base i.e. a data type such as Age
Simple
Simple types are derived from primitive types but they usually have additional
- condtrained range.
- upper and lower range (normal range)
- Can have a unit of measure.
- Can have a regular expression as a constraint.
- Or a complex rule constraint i.e. checksum written in groovy or java
Can be a:
- Range
- Quantity
- i.e. age, distance, duration, currency
- Result
- Timing
- Ratio
- Regular expressions or Measurement Units etc.
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3) Age is measured in years i.e. it uses the Year measurement unit
Enumerated
Enumerated types are ordered collections of individuals or codes
i.e. M:Male, F:Female, U:Unknown
For Example:
Note:
1) Enumerations codes and descriptions
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*in addition you can create subsets of enumerations
Complex / Reference Types
In some cases it is useful to model data types that are reference type. These use a class as the reference type.
i.e. a data type address could have a Type of Address which includes first line, postcode, country etc.
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