Template Attribute Definition
A template attribute definition uses the Velocity Template Language to construct values from its dependencies.
Note that at present, it is only safe/useful to use a DataConnector as a dependency to this plugin. Using an AttributeDefinition as a dependency (no matter the type) will produce very confusing results.
1. Define the Definition
The definition is defined with the element
<resolver:AttributeDefinition xsi:type="Template" xmlns="urn:mace:shibboleth:2.0:resolver:ad"> with the following required attribute:
- id - assigns a unique, within the resolver, identifier that may be used to reference this definition
and the following optional attributes:
- dependencyOnly - a boolean flag that indicates the attribute produced by this definition is used only by other resolver components and should not be released from the resolver (default value: false)
2. Define Dependencies
It is very common for one component, like attribute definitions, within the attribute resolver to depend on information retrieved or constructed from another component.
Dependencies are expressed by the
<resolver:Dependency> with a
ref attribute whose value is the unique ID of the data connector that this connector depends on.
3. Define Template and Source Attributes
Template attribute definitions require one or more
<SourceAttribute> elements to define which attributes from the connector's dependencies will be made available to the template engine. Note, every source attribute must have the same number of values.
The template is defined using a single
<Template> element. If no template is defined, a default template is used which combines all source attributes into a space-delimited list.
The following example demonstrates constructing
eduCourseOffering attributes by combining three different attributes obtained from the definition's dependencies.