The ExpressionElement type exposes the following members.
Gets or sets the GUID of this expression. Returns Guid.Empty if the expression element will not need to be correlated to anything (as would, for example, a string and Guid representing a Step Name element.)
Gets or sets the name of this expression. Returns string.Empty if the expression element does not reasonably have a name. Macros and placeholders for OpSteps, for example, have names, where rote strings do not.
Gets the type of this expression element - used primarily for ascertaining type compatibility between expressions.