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A

abstract class: User- or system-defined class that cannot be instantiated. An abstract class can be a direct superior class, and can provide definitions common to its subclasses. Contrast with concrete class.

abstract type: A name declared with an abstract type contains a value whose concrete type is any of that abstract type's subtypes. G2 offers these abstract types: item-or-value, value, and quantity. Contrast with concrete type.

action: A command that G2 can execute within a rule, procedure, action button, or user menu choice.

activatable subworkspace: The subworkspace of an item that has been configured using this configuration statement:

allocation message: A message that G2 prints on the console when it allocates more memory during KB loading or execution.

allocation report: An allocation table or message.

allocation table: A table that G2 prints on the console when G2 begins execution. The table describes memory requirements, defaults, requests, and initial allocations.

annotation: The textual representation of compound attributes. For charts, the annotation describes the chart type and format. For trend charts, an annotation is a detailed syntactical description of the non-default values of component attributes and component defaults.

antecedent: In a rule, the phrase that specifies the conditions for executing the actions in the rule's consequent. A rule's antecedent specifies a truth-value expression. Contrast with consequent.

area box: A heavy-bordered rectangle within which you select an area of a workspace, as part of the Operate on Area workspace menu choice.

argument: A value or item that is passed to an invoked procedure or function.

asynchronous mode: A GFI input mode that typically provides a KB with asynchronous events that occur over the course of the KB's execution.

attribute: A characteristic or property of an item (any object, connection, workspace, and so on) in a G2 knowledge base. An item's set of attributes is defined by the item's class.

attribute descriptions: The detailed internal specifications of an attribute. All attribute descriptions appear in the G2 Class Reference Manual.

attribute display: A display that shows the values, and optionally the names, of one or more attributes of an item. You can move an attribute display by dragging with the mouse, and you can edit an attribute's value after clicking the mouse on an attribute display. You can also apply configurations to an item's attribute displays. Contrast with name box.

attribute file: A text file, external to G2, that specifies values for one or more attributes of one or more existing items in a KB. Use an attribute file to populate programmatically the attribute values of existing items.

attribute table: A two-column table that shows the name and value of each attribute of an item.

authorization file: Also known as the g2.ok file. This file identifies each authorized user and optionally associates each user name with a user mode.

authorization level: A method for managing G2 license options with Gensym's Telewindows license options.

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