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  1. The reference tag $R has been eliminated, with variables and properties generalized to $.
  2. The index tag $I has been generalized to include keys to a Map.

TAG

TYPE

${...}

VariableReference

$C{...}

Constant

$E{...}

Logico-Arithmetic Expression

$G{...}

Global VariableReference

$I{...}

Index to Array-like Reference, or Key to Map

$L{...}

Literal

Except for restrictions on where to place the placement of index tags ($Ithey must be inside a reference and cannot be nested inside other index tags), all of these are nestable within one another and to an arbitrary depth. Some simpler examples:

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