3.9.2 Repeat

Attributes can have single or multiple values. Note that it is the value that matters more than the attribute here. An attribute can only take a comma-separated list of values if it is defined as multiple.

For an attribute defined as single in an object template, there can only be one instance of this attribute in an object of that type and it can only have a single value (even if this attribute is defined as being able to have a list of values).

For an attribute defined as multiple in an object template, there can be many instances of this attribute in an object of that type. If any of these attributes can have a list of values then it is allowed for multiple attributes.

There is no limit on the number of times a multiple attribute can be added to an object. But there is an overall limit on the size of an object.

Types of ‘repeat' of an Attribute

Type

Definition

[single]

Objects can only contain one instance of this ‘attribute–value' pair.

[multiple]

Objects may contain more than one instance of this attribute. For some attributes, an instance may contain a list of values, separated by commas.

This documentation is in draft status.
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