export ("M" Reference)

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For a declaration to be referenced by other modules, the declaration must be explicitly exported using an export directive.

Syntax

exportidentifiers;

Identifiers is a list of one or more identifiers of declarations in this module that can be referenced from other modules.

Multiple export statements can occur inside a module.

Discussion

Modules may refer to exported declarations in other modules by using an import ("M" Reference) directive to name the module that contains the referenced declarations.

Within a module, any import directives must appear before any export directives, and any export directives must appear before any declarations.

Examples

For example, consider the following module.

module Contacts 
{
    export Person;

    type Address 
    { 
         Street: Text; 
         City: Text;
    }
    type Person  
    { 
         FirstName : Text; 
         Age : Integer32; 
    }
}

The type Address can only be referenced from within the module Contacts. The type Person can be referenced in any module that has an import directive for module Contacts, as shown in this example.

module Friends 
{
    import Contacts;
    Friends : Person*;
}

See Also

Concepts

import ("M" Reference)