Abstract Class Name: Time Point

Superclass - <Base Time Data>

Subclasses

• <Absolute Time>
• <Relative Time>

Definition

An instance of this DRM class specifies a point in time.

Primary Page in DRM Diagram:

• 20

Secondary Pages in DRM Diagram:

• 23

Example

See concrete subclasses for examples.

FAQs

What is the purpose of this class?

This class provides 1) ISO 19115-compliant metadata that describes the point in time when a high-level DRM object (e.g., an instance of <Transmittal Root>, <Model>, or <Image>) was created, and 2) a general-purpose mechanism for describing points in time. It allows potential users of a transmittal to evaluate the age of a transmittal, without necessarily having to obtain or examine the transmittal itself.

When is an instance of <Relative Time> required rather than an instance of <Absolute Time>?

An instance of <Absolute Time> always represents a GMT time. Instances of <Relative Time> can be used to represent alternate time references, such as simulation time or Julian dates.

Constraints

• <<Publishable Object>>

Component of (two-way) (inherited)

• zero or more <Environment Root> instances
• zero or more <Time Constraints Data> instances
• zero or one <Transmittal Root> instance

Inherited Field Elements

Notes

Fields Notes

time_significance

The time_significance field specifies the usage of the time information.