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→Pluggable Conversion Engines
* It would be quite hard if even possible to define custom 'common formats' between subsets of federations using the 'big' eduGAIN MDS. It would be necessary if some federations have different levels of cooperations requiring different attributes.
=== Pluggable Conversion Engines The Shibboleth Way ===Shibboleth uses <code>*AttributeDefinition</code> elements to define conversion rules from data source (i.e. LDAP) attributes to "resolved" attributes. <code>AttributeDefinition</code>s can depend on <code>DataConnector</code>s or other <code>AttributeDefinition</code>s. It can be used for attribute conversion in eduGAIN as well if we can define a <code>DataConnector</code> that can use attributes retrieved from the IdP (at the HBE) or from the HBE (at RBE). Shibboleth2 has a number of built-in <code>AttributeDefinition</code>s:* [https://spaces.internet2.edu/display/SHIB2/ResolverSimpleAttributeDefinition SimpleAttributeDefinition]: pass through the retrieved value of the attribute* [https://spaces.internet2.edu/display/SHIB2/ResolverScopedAttributeDefinition ScopedAttributeDefinition]: append a scope to the attribute value* [https://spaces.internet2.edu/display/SHIB2/ResolverTemplateAttributeDefinition TemplateAttributeDefinition]: sets value based on an arbitrary template of constant string and other attributes* [https://spaces.internet2.edu/display/SHIB2/ResolverMappedAttributeDefinition MappedAttributeDefinition]: sets value according to conditions on (possibly other) attribute values* [https://spaces.internet2.edu/display/SHIB2/ResolverScriptAttributeDefinition ScriptAttributeDefinition]: execute a [https://scripting.dev.java.net/ JSR-223] (Java) script to determine the attribute value. This script gets the context information in <code>requestContext</code> variable.* ... and some others ...
