...
Note that since the sources.xml file supports virtual attributes, you also have the option of having multiple attributes within one search index (comma separated) and then just give the user a single search option. The built in searches will only search on one field in each query. Though you can populate multiple search columns if you want certain users to have access to search on additional (e.g. private) attributes and then use the security described below to limit who can search on which fields. To specify the search and sort attributes for the Group Source Adapter (g:gsa) or person sources that are configured in sources.xml, add an init-param for each attribute where the param-name is searchAttribute[0-4] or sortAttribute[0-4] and the param-value is the name of the attribute. The attribute should be obtainable via subject.getAttributeValue(attributeName, false) - Note that for the jdbc sources, the name isn't necessarily the database column name. It needs to be a subject attribute.
...