Discussed in telecon. We may want to provide a more generic mechanism using a pattern like a regular expression or XML pattern. And then define patterns for specific derived types like the existing URIString and this proposed TrimmedString.

To define this in a more generic way would require the DataType to be a Structure consisting of the String and a manipulation defining string pattern or expression.
Is this what is needed or is it really just a classification of DataType String to indicate to a client that it will not have leading and trailing whitespace?

One option would be to define a 'ManipulatedString' DataType which would indicate some processing is done by the Server. This type would then be subtyped to define specific manipulations such as TrimmedString. We could also use the ManipulatedString subType of String in a Structured DataType to create a regulate expression or pattern based Manipluated String type. The Structure would include the ManipulatedString and a second string which defines the expression or pattern.

I suggest we start with the ManipulatedString DataType and maybe some other subtypes such as TrimmedString, LowerCaseString, UpperCaseString. We can then decide in a future step if we need the Structured DataType.

The intended solution was not described very well in my note.

The idea is to define a Property for DataTypes that contain a RegularExpression.
So the TrimmedString would still be a subtype of String, but the DataType would have a property describing the pattern.

Other DataTypes, potentially in any place of the DataType hierarchy, can have this property as well. Does not need a common supertype.
However, maybe we want to restrict to subtypes of String.

BTW: The Property can be in a later version of the Spec, the TrimmedString is needed rather short term.

Agreed to create a TrimmedString as a subtype of String DataType now.
Will clone this issue as a feature request for a regular expression property to be added to a DataType to describe some manipulation.
Should consider both string and numeric manipulations.

Added TrimmedString type

Cloned 7397 to address future feature to define Regular Expression DataType