Examples of subject scheme maps This section contains examples and scenarios that illustrate the use of subject scheme maps. Example: a subject scheme map used to define taxonomic subjectsA subject scheme map can be used to define taxonomic subjects. Once defined, the subjects can be referenced by specifying a @subjectrefs attribute on a <topicref> element.Example: How hierarchies defined in a subject scheme map affect filteringThis scenario demonstrates how a processor evaluates attribute values when it performs conditional processing for an attribute that is bound to a set of controlled values.Example: Defining values for deliveryTargetYou can use a subject scheme map to define the values for the @deliveryTarget attribute. This filtering attribute is intended for use with a set of hierarchical, controlled values.Parent topic: Subject scheme maps and their usage