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U

unit of measure: A unit such as meters or seconds suffixed to a quantity. G2 provides system-defined units of measure, and you can define additional units of measure as needed.

unmodularized: A KB file or the current KB is unmodularized when it contains no modules, or when it contains modules that are not consistently modularized. Contrast with consistently modularized.

unqualified filename: A filename without an extension.

user menu choice: An item that associates an action and menu choice text with a class. You can select a valid user menu choice from the menu of an eligible (sufficiently configured) item of the specified class or any of its subclasses. You can select a user menu choice only while the current KB is running and while the expression specified in the user menu choice item's Condition attribute produces the truth-value true.

user mode: A non-reserved symbol that represents a category of usage or level of access to the current KB's knowledge. Declare a user mode simply by naming it in at least one configuration statement in at least one item in your KB. A G2 authorization file associates each authorized user name with a user mode.

user modes clause: A syntactic element of a configuration statement that names a user mode.

user-defined attribute: For a user-defined class, an attribute that is defined in the Class-specific-attribute attribute of this class's definition item, or in the same attribute in the definition of some user-defined superior class of this class. Contrast with system-defined attribute.

user-defined class: The class that is defined by an object definition, connection definition, or message definition. Create a user-defined class to represent a template for set of knowledge not provided by instances of G2's system-defined classes. Contrast with system-defined class.

user-defined function: The result of creating and specifying a function definition item. A user-defined function names an operation that takes zero, one, or more than one item or value as arguments, and returns the item or value that results from G2's using the arguments to evaluate the function's specified expression.

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