Webel: SysML4Mathematica: An '@' prefix in the name of a Block indicates a data structure (such as an Association or List) that does not have a corresponding MTools class or a Webel Abstract Data Type (ADT) "pseudo class" in the Wolfram Language code.

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In the Webel recipe for modelling Mathematica code in Systems Modeling Language v1 (SysML®) - specifically SysMLv1.x - an '@' prefix in the name of a Block indicates a data structure (such an Association or List) that is not encapsulated in Mathematica code as an MTools class.

Where such a Block represents an Association '<||>' or List '{}' it may extend one of the corresponding representing Blocks:

Typically a Block prefixed with '@' represents an "analysis" block that is a candidate for upgrading to an MTools class.

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