Merge pull request #50 from michielbdejong/patch-2

Fix  missing prefixes in agentGroup example

Author: kjetilk

README.md

@@ -265,7 +265,9 @@ Corresponding `work-groups` Group Listing document:
 ```ttl
 # Contents of https://alice.example.com/work-groups
 @prefix    acl:  <http://www.w3.org/ns/auth/acl#>.
+@prefix     dc:  <http://purl.org/dc/elements/1.1/>.
 @prefix  vcard:  <http://www.w3.org/2006/vcard/ns#>.
+@prefix    xsd:  <http://www.w3.org/2001/XMLSchema#>.
 
 <#Accounting>
     a                vcard:Group;