Request: A TextField for storing (xml) strings in text documents, whose 
displayed content can be set arbitrarily.

TextFieldMaster.User allows to specify a "value" of type double (purpose?), 
a "content" of type string which is the displayed value and a boolean.

Would it be difficult to extend this by a variable "hiddenContent" of type 
string.

This way applications could store variables in the document and display them in 
the form the user decides.

e.g. the string would be something like:
<pd><name>John Smith</name><initials>JS</initials></pd>

At first insertion by the application the document would show only "John 
Smith". After a switch the application would be able to go through all the 
variables and exchange the shown value to the initials "JS".

Or whatever a different application would want to decide to store and display. 
This would be very flexible.

You could further enhance the flexibility by providing a "changable" boolean 
field - if the user himself is able to change the displayed string and 
a "plugin" string field, which leads to a notification of a registered 
plugin/application if the user clicks the field.

Hope I did not ask for too much,

Ido Tamir