||Sets a description of the current data type.
||Sets an id that can be used to reference this element.
||Set the 'if' condition.
The processor will be ignored unless the property is defined.
The value of property is insignificant, but values that would imply
misinterpretation ("false", "no") will throw an exception when
isActive() is evaluated.
||Sets file to precompile.
Should be a source file that includes only one unguarded header file.
Default value is "stdafx.cpp".
||Specifies that this element should behave as if the content of the
element with the matching id attribute was inserted at this location.
||Set the 'unless' condition. If named property exists at execution time,
the processor will be ignored.
Value of property is insignificant, but values that would imply
misinterpretation ("false", "no") of the behavior will throw an
exception when isActive is called.