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<#if doc.assocs["xxx:Friends"]?exists> ${doc.assocs["xxx:Friends"][0].properties.fullName} </#if>
Have you ever tried "name" instead of "fullName" ?
In fact what did you really want to do ? I did not quite understand
${doc.assocs["xxx:Firends"][0].properties}
${doc.assocs["xxx:Firends"][0].properties["usr:authorityName"]}