ISO/IEC 18023-1:200x(E) — Table 6.226 DRM_Scale_Control

Table 6.226 — DRM_Scale_Control_Link

Property

Description

Class

<DRM Scale Control Link>

Superclass

<DRM Control Link>

Subclass

None.

Definition

An instance of this DRM class is a specialized <DRM Control Link> used to provide the connection between an ordered aggregation of <DRM Expression> instances and the target fields of a <DRM Scale>.

The expr_index field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that defines <DRM Scale>'s scale_amount field.

The lower_index field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that defines the lower limit for <DRM Scale>'s scale_amount.

The upper_index field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that defines the upper limit for <DRM Scale>'s scale_amount.

Class diagram

Figure 6.271 — DRM_Scale_Control_Link

Inherited field elements

Field name	Range	Field data type
description ¹		String

Field elements

Field name	Range	Field data type
expr_index ²		Integer_Positive
lower_index ³		Integer_Unsigned
upper_index ⁴		Integer_Unsigned

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)

one or more {ordered} <DRM Expression> instances

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

None.

Component of (two-way)

one or more <DRM Scale> instances

Constraints

Publishable Object

Clarifications

¹ This is a text description of the given <DRM Control Link> instance's purpose.

² This identifies a component <DRM Expression>, the value of which specifies the value of the scale_amount field of the affected <DRM Scale> instances.

³ If non-zero, this is the index of the component <DRM Expression> defining the lower limit of the scaling. A value of zero means no lower limit was defined.

⁴ If non-zero, this is the index of the component <DRM Expression> defining the upper limit of the scaling. A value of zero means no upper limit was defined.

Example(s)

Externally Controlled Table-Based Animation
Consider a <DRM Scale Control Link> instance that is to be driven using values from a <DRM Property Table>. The table value that is to be used is to be specified from outside the transmittal.
For simplicity, in this example the controlling <DRM Expression> is just the table value itself, rather than some more complex <DRM Function> using the table value as an argument. Specifically, the <DRM Scale Control Link> instance's controlling <DRM Expression> is the <DRM Predefined Function> TABLE_VALUE, the argument of which is a <DRM Property Table Reference> referring to the <DRM Property Table> containing the scale values, as shown in the instance diagram.

Figure 6.272 — <DRM Scale Control Link> example

The <DRM Variable> instance drives the <DRM Property Table Reference Control Link>, so that it determines which value is referenced from the <DRM Property Table>. To provide the hook for this <DRM Variable> to be set from outside the transmittal, the <DRM Variable> is associated with an <DRM Interface Template> (not shown).