ISO/IEC 18023-1:200x(E) — Table 6.6 DRM_Absolute_Time

Table 6.6 — DRM_Absolute_Time_Interval

Property

Description

Class

<DRM Absolute Time Interval>

Superclass

<DRM Time Interval>

Subclass

None.

Definition

An instance of this DRM class represents an interval of time defined by an absolute (GMT) start time, specified by the <DRM Absolute Time> component, and a duration, specified by the fields of the <DRM Absolute Time Interval> itself.

<DRM Absolute Time Interval> provides

a means to specify a time interval in terms of absolute time (GMT) for metadata, and
a general-purpose mechanism for describing intervals specified in terms of absolute (GMT) time.

Class diagram

Figure 6.4 — DRM_Absolute_Time_Interval

Inherited field elements

Field name	Range	Field data type
time_significance ¹		Time_Significance

Field elements

Field name	Range	Field data type
delta_days ²		Integer
delta_hours ³		Byte_Unsigned
delta_minutes ⁴		Byte_Unsigned
delta_seconds ⁵	[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)

one <DRM Absolute Time> instance⁶

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
zero or more <DRM Season> instances
zero or more <DRM Sound Instance> instances
zero or more <DRM Source> instances

Component of (two-way)

None.

Constraints

Clarifications

¹ This indicates the significance of the time information.

² This is the number of days since the start of the <DRM Absolute Time Interval>.

See constraints on this class for cases where this may be negative.

³ After delta_days has been taken into account, this is the number of hours since the start of the <DRM Absolute Time Interval>, and therefore shall be a value between 0 and 23.

⁴ After delta_days and delta_hours have been taken into account, this is the number of minutes since the start of the <DRM Absolute Time Interval>, and therefore shall be a value between 0 and 59.

⁵ After delta_days, delta_hours, and delta_minutes have been taken into account, this is the number of seconds since the start of the <DRM Absolute Time Interval>.

Fractions provide higher accuracy if needed, such as milliseconds.

⁶ This represents the start of the <DRM Absolute Time Interval>.

Example(s)

Consider a SEDRIS transmittal for which the data provider is to specify the time period for which that transmittal is to be considered valid. To specify this information, the <DRM Transmittal Root> of the transmittal has an <DRM Absolute Time Interval> component for which time_significance is set to PERIOD_OF_CONTENT. The stop time specified by the <DRM Absolute Time Interval> can be considered to be an “expiration date”.