This is a subclass of Symbol representing a single element. An ElementSymbol also is an expression and thus has a type. Element symbols have a variety of attributes that determine how they are displayed - a flag for displaying fully qualified and an optional vdb name.
The "isExternalReference" property indicates whether the element symbol refers to an element from a group outside the current command. Typically this is set to false. Common uses when this is set to true are for variables used within a command, correlated elements within a command, etc.
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