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The <AttributeFilterScript> element implicitly iterates over all entity attributes in the input stream. For each entity attribute, if the predicate evaluates to false, the entity attribute is removed from the input stream if (and only if) the predicate evaluates to false.

Schema

The <AttributeFilterScript> element is a configuration element of type ScriptType. Both the element and its type are defined by the urn:mace:shibboleth:2.0:metadata schema, which can be located at http://shibboleth.net/schema/idp/shibboleth-metadata.xsd.

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<AttributeFilterScript>
    <Script>
    <![CDATA[
        // anAn implementation of Predicate<Attribute>
        // applied to the input argument
        //
        // theThe input argument is of type:
        // org.opensaml.saml.saml2.core.Attribute
        //
        (function (attribute) {
            "use strict";

            // do not remove the entity attribute
            if (attribute === null) { return true; }

            // implement the predicate here...
        }(input));
    ]]>
    </Script>
</AttributeFilterScript>

The actual input argument is an instance of a class that implements the Attribute interface. The formal parameter name is arbitrary. In the previous example, the parameter name attribute is used for clarity.