ISO/IEC 18023-1:200x(E) — Table 6.215 DRM_Relative

Table 6.215 — DRM_Relative_Time

Property

Description

Class

<DRM Relative Time>

Superclass

<DRM Time Point>

Subclass

None.

Definition

An instance of this DRM class is used to specify a date and time relative to either a specified GMT (<DRM Absolute Time>); or if an <DRM Absolute Time> is not specified, relative to the simulation start time.

Class diagram

Figure 6.259 — DRM_Relative_Time

Inherited field elements

Field name	Range	Field data type
time_significance ¹		Time_Significance

Field elements

Field name	Range	Field data type
delta_days		Integer
delta_hours	[0..23]	Byte_Unsigned
delta_minutes	[0..59]	Byte_Unsigned
delta_seconds ²	[0.0..59.0]	Long_Float

Associated to (one-way) (inherited)

None.

Associated to (one-way)

None.

Associated by (one-way) (inherited)

None.

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

None.

Composed of (two-way)

zero or one <DRM Absolute Time> instance

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

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

Component of (two-way)

None.

Constraints

Clarifications

¹ This indicates the significance of the time information.

² Fractions provide higher accuracy if needed, such as milliseconds.

Example(s)

The date / time is a astronomical Julian day of 2449143.77083 (June 5, 1993 0630Z). Astronomical Julian dates are referenced to 1 January 4712 BCE at 12Z. Since the fractional days shall be converted to hours, minutes and seconds, the fields in the <DRM Relative Time> instance are as follows.

delta_days	2449143
delta_hours	18
delta_minutes	30
delta_seconds	0,0

The fields in the component <DRM Absolute Time> are as follows.

time_value. configuration	DATE_YMD_AND_TIME_H
time_value. value.ymd_h. year	-4712
time_value. value.ymd_h. month	JANUARY
time_value. value.ymd_h. day	1
time_value. value.ymd_h. hour	12

The time is 6 hours 25 minutes and 30 seconds after the start of the simulation. The fields of the <DRM Relative Time> instance are set as follows.

delta_days 0

delta_hours 6

delta_minutes 25

delta_seconds 30,0
An object becomes active 20 minutes after the simulation starts. That is, its activation time is expressed in simulation time (relative to the start of the simulation), so the activation time would be specified using <DRM Relative Time>. The time_significance field would be set to CONTEXT_DETERMINED.