For the purposes of this document, the terms and definitions given in ISO/IEC 19775-1 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org

3.1
errors

reasons for unsuccessful termination of a service

3.2
file

collection of related data stored on physical media or existing as a data stream or as data within a computer program

3.3
initializeOnly field

field defined as part of a node definition whose value may only be specified at the time that the node is instantiated

3.4
input-capable field

either an inputOnly field or an inputOutput field

3.5
inputOnly field

field defined as part of a node definition which may only receive events

3.6
inputOutput field

field defined as part of a node definition that is capable of both receiving events and sending events

3.7
now

present time as specified by the user's system clock

3.8
output-capable field

either an inputOutput field or an outputOnly field

3.9
outputOnly field

field defined as part of a node definition which may only send events

3.10
parameters

values passed into a service

3.11
public interface

formal definition of a node type in this document

3.12
returns

values returned by an invocation of a service

3.13
run-time name scope

extent to which an identifying name defined within an X3D file applies and is visible throughout the rest of the X3D scene graph