4. Declarations
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A declaration is either a constant or variable data item, or a mkRefTxt("Patterns","pattern"); .
A data-item is either an mkRefTxt("Object references","object-reference"); or a mkRefTxt("Value objects","value object"); .
Grammar
<Declaration> ::= <Data-Item> | <Pattern-Declaration>
<Data-Item> ::= <Object-Reference> | <Value-Object>