5.2.1.4 Option Private Directive
Option Private directives control the accessibility of a module (section 4.2) to other projects (section 4.1), as well as the meaning of public accessibility of Public entities (section 2.2) declared within the module.
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option-private-directive = "Option" "Private" "Module"
Static Semantics:
If a procedural module (section 4.2) contains an <option-private-directive>, the module itself is considered a private module, and is accessible only within the enclosing project.
If a procedural module does not contain an <option-private-directive>, the module itself is considered a public module, and is accessible within the enclosing project and within any projects that reference the enclosing project.
The effect of module accessibility on the accessibility of declarations within the module is described in the definitions of specific module declaration form within section 5.2.3.