3 Definitions

3.1 Introduction

For the purposes of this part of ISO/IEC 14772, the definitions in this clause apply. Definitions contained in Part 1 apply and are not replicated in this clause. Terms from this clause are italicized when used outside their definitions. Other terms are formatted in the normal font.

Table 3.1 defines the contents of this clause

Table 3.1 -- Table of Contents
3.1 Introduction
3.2 browser
3.3 event
3.4 external 3.5 service
3.6 token
3.7 URL
3.8 URN 3.9 VRML Browser
3.10 Web Browser

**Table 3.1 -- Table of Contents**
3.1 Introduction 3.2 browser 3.3 event 3.4 external	3.5 service 3.6 token 3.7 URL 3.8 URN	3.9 VRML Browser 3.10 Web Browser

3.2 browser

A computer program that interprets files accessed, presents their content to a user on a display device, and allows the user to interact with them. There may be two forms of browser discussed: a Web Browser and a VRML Browser. When used as an unqualified word within this part of ISO/IEC 14772, the VRML Browser meaning shall be implied.

3.3 event

A message sent from either a node or the browser itself to the external application. Events signal external stimuli, changes to field values, and interactions between nodes. An event consists of at least a timestamp and a field value. There are two forms of events: VRML events that are defined in 2.VRML and information that is passed from the VRML Browser to the external environment.

3.4 external

External means anything that exists outside of the VRML Browser environment. This may take the form of a container application that holds a VRML Browser, or a client/server style environment where the VRML Browser forms the client and the application is a server located on a remote machine.

3.5 service

The method of interfacing between external applications and the browser.

3.6 token

An application supplied value which is returned with an event to identify the registration for that event.

3.7 URL

Uniform Resource Locator. See 2.[URL].

3.8 URN

Universal Resource Name. See ISO/IEC 14772-1, E.[URN].

3.9 VRML browser

A computer program that interprets VRML files, presents their content to a user on a display device, and allows the user to interact with worlds defined by VRML files by means of a user interface. (See 2.VRML)

3.10 Web Browser

A computer program that is used to interpret and display files that have been retrieved over the Internet. Typically, this involves using the HTTP transfer protocol and HTML documents, but may include other types of data.