Model component for value element. This element defines a value that
can be represented as a simple text string, which may be expressed as an
attribute, element, or text component of the XML document.
author: Dennis M. Sosnoski
Check if this value implicitly uses the containing object. This call
is only meaningful after prevalidation.
true if using the containing object,false if own value
Set style that applies to this value. If the specified style is different
from the nested default it is applied directly, otherwise this value is
configured to use the default. This method should therefore only be used
when the nested settings are considered fixed.
TODO: implement this with parent links
Parameters: style - style value