Simple Stack -based structure for tracking the logical position during
a parsing process. entries are added to the stack at
each point during the parse phase in a reader-specific manner.
Calling toString() will render a tree-style view of the current logical
position in the parse phase. This representation is intended for use in
error messages.
Calling toString() will render a tree-style view of the current logical position in the parse phase. This representation is intended for use in error messages.