Leading sign format strings

Sub-String Name Sub-String Value Positive Negative
Leading-Sign "L" + Positive + Negative + Zero(1)

-or-

Req Req
  "L" + "[" + Positive + "]" + Negative + Zero(1)

-or-

Opt Req
  "L" + Positive + "[" + Negative + "]" + Zero(1)

-or-

Req Opt
  "L" + Positive + Zero(1)

-or-

Req -
  "L" + Negative + Zero(1) - Req

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