Var` package: Register variables with e$var$add

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[TECHNICAL SLIDE TRAIL] The Webel libraries for Wolfram Mathematica: With SysMLv1 models.
Section
SECTION: The Webel Var` package Entity-based variable registry
Mathematica keywords
Entity
Webel Mathematica keywords
Var`
W`Base`
'e$var$'
e$var$add
Keywords
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Var` package: ‘sym$’ markup reused in ‘$E$’ functions
Notes
[CONVENTION, NAMING, PATTERN, POLICY]{STRICT} Webel: Mathematica: CONVENTION: Entity "field definers" are prefixed with '$e$[pac]' (where '[pac]' is a nickname for a package or logical grouping) and carry String field names. EntityStore functions are prefixed with 'e$[pac]'.
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Var` package: ‘sym$’ markup reused in ‘$E$’ functions
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