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SEMI E125-0305 © SEMI 2003, 2005 23 10.5.2.10 Because the mapping from an availa ble unit to the Configuration Para meter setting that selects it is described by the UnitConfi g class, it is not re quired t o use the “af…

SEMI E125-0305 © SEMI 2003, 2005 22

10.5.2.5 RealType — Represents a real (for example, floating point) number type, and associated units.

10.5.2.6 RealType Attribute Definition Table

Table 33 RealType Attribute Definition

Attribute Name Definition Required Form

digitsOfPrecision The maximum number of digits that can be

provided after the decimal point by variables of

this type.

N Integer  0. If 0, there is no

restriction on the number of digits of

precision.

10.5.2.7 RealType Association Definition Table

Table 34 RealType Association Definition

Association Role Name Definition Comments

units The available units specified for this type. Either:

One and only one element of type Unit

or:

Two or more elements of type UnitConfig, if the

type supports configurable units.

Figure 13

Describing Configurable Units

10.5.2.8 Some equipment may support the ability to provide Parameter values in more than one set of units. For

each independently configurable set of units available, the equipment shall support one non-transient unit

configuration Parameter to control which units are used when communicating the values of such Parameters. The

ParameterType of such unit configuration Parameters shall be a string-based enumeration (see Section 10.5.4.1.3 ).

Each value in the enumeration shall correspond to a different unit configuration. Figure 13 shows the classes used

to describe configurable units. Not all associations and attributes of the Unit, Parameter, ParameterTypeDefinition,

ParameterType, and EnumerationType classes are shown for clarity.

NOTE 2: The equipment is not required to support configurable units in order to comply with E125; however if the equipment

does support configurable units, it shall describe the available units and their configuration using the classes defined in this

section.

10.5.2.9 The UnitConfig class (shown in Figure 13) is used to provide a mapping from each possible unit choice for

a given numeric ParameterType to the enumeration Parameter setting that selects that unit. For example, the

equipment may provide a single unit configuration Parameter to select between meter-kilogram-seconds (mks),

centimeter-gram-seconds (cgs), and English units. In that case, every numeric type with configurable units

appearing in a ParameterTypeDefinition would provide 3 UnitConfig instances – one for each of the 3 possible

enumeration settings available from the unit configuration Parameter.

Unit

0..1

unit

configParameter

UnitConfig

0..1 setting

EnumeratedString

value

description

0..1

Parameter

0..*

1..*

values

typeInformation

ParameterTypeDefinition

typeInformation

ParameterType

EnumerationType

SEMI E125-0305 © SEMI 2003, 2005 23

10.5.2.10 Because the mapping from an available unit to the Configuration Parameter setting that selects it is

described by the UnitConfig class, it is not required to use the “affectedParameters” attribute (see Section

10.4.11.5.1) to refer to the Parameters whose units are changed by the Configuration Parameter when describing its

classification.

10.5.2.11 If a ParameterTypeDefinition includes numeric types with configurable units, then all Parameters that are

declared to be of that type shall support the configurable units described in the ParameterTypeDefinition.

10.5.2.12 UnitConfig — This class describes a configurable unit setting available for a numeric ParameterType.

UnitConfig provides a mapping between the available unit, the non-transient configuration Parameter used to change

the selected unit, and the enumeration value of that configuration Parameter that results in the selection of the unit.

This class has no attributes.

10.5.2.13 UnitConfig Association Definition Table

Table 35 UnitConfig Association Definition

Association Role Name Definition Comments

unit An available unit supported by this type. One and only one element of type Unit.

configParameter The unit configuration Parameter whose value

selects the unit.

One and only one element of type Parameter.

The Parameter must have a string-based

enumeration ParameterTypeDefinition.

setting The enumeration value which, when set on the

corresponding configParameter, results in the

available unit being selected.

One and only one element of type

EnumeratedString.

10.5.2.14 StringType — Represents a string type.

10.5.2.15 StringType Attribute Definition Table

Table 36 StringType Attribute Definition

Attribute Name Definition Required Form

language Identifies the language used to represent the string. Y Text, must be equal to an IETF RFC

1766 language tag, using ISO 3166 to

name countries and subdivisions, and

ISO 639 to name languages.

maxCharacters The maximum number of characters that this string

can contain.

N Integer  0. If 0, there is no restriction

on the number of characters.

10.5.2.16 BooleanType — Represents a Boolean type.

10.5.2.17 BinaryType — Represents a binary type.

10.5.3 Composite Type Description

10.5.3.1 Describing Arrays

10.5.3.1.1 Arrays are container types that can hold one or more values that are of the same type. Figure 14 shows

how to describe the type of the elements in a given array. An array can refer to only one of the primitive or

composite types, and can declare that it has a maximum number of elements. For example, an array description that

has a maxElements value of 0 and refers to the RealType primitive type represents an array of real numbers (for

example, float or double) that has no limitation on the number of values it can contain.

10.5.3.1.2 Each element of an array must represent the same physical concept. For example, an array of real

numbers must not be used to represent a repeating sequence of a measured value in odd-numbered elements and the

uncertainty for the measurement in even-numbered elements. In such cases, an array of StructureType elements is

the correct representation, where the different concepts appear as different fields in the structure (for example, a

measurement field and an uncertainty field). A human-readable description of the meaning of the array elements is

required.

0..*

typeInformation

{XOR}

minElements

maxElements

elementDesc ription

ArrayType

typeInformation

ParameterTypeDefinition

ParameterType

Figure 14

Describing Arrays

10.5.3.1.3 ArrayType Attribute Definition Table

Table 37 ArrayType Attribute Definition

Attribute Name Definition Form

minElements The minimum number of elements that can be held

in the array.

Positive integer, with 0 representing no

restriction on the minimum number of

elements. If this attribute and

maxElements are both non-zero, the value

of this attribute must be less than

maxElements.

maxElements The maximum number of elements that can be held

in the array.

Positive integer, with 0 representing an

unlimited number of elements. If this

attribute and minElements are both non-

zero, the value of this attribute must be

greater than minElements.

elementDescription A human-readable description of the purpose of the

elements in the array.

Text.

10.5.3.1.4 ArrayType Association Definition Table

Table 38 ArrayType Association Definition

Association Role Name Definition Comments

typeInformation Describes the data type of each element

contained in the array.

Structured data, must be one and only one of the

following: any type derived from

ParameterType, or a ParameterTypeDefinition

(can be a recursive reference from within the

same ParameterTypeDefinition).

10.5.3.2 Describing Structures

10.5.3.2.1 Structures are composite types that can hold one or more fields that are of differing primitive or

composite types. Figure 15 shows how a structure is described as a collection of one or more typed field’s.