The permision object at the bottom assigns several rights (in this case all 4) to an #agent to access #accessTo

stream-group.json

{
    "http://groups.event-processing.org/id/MyGroupA#group" :
    {
        "http://purl.org/dc/elements/1.1/title": [ { "type" : "literal", "value" : "MyGroupA group" } ],
        "http://purl.org/dc/elements/1.1/description": [ { "type" : "literal", "value" : "The Play MyGroupA group" } ],
        "http://www.w3.org/2002/06/xhtml2/icon": [ { "type" : "uri", "value" : "http://s-static.ak.facebook.com/rsrc.php/yi/r/q9U99v3_saj.ico" } ],
        "http://www.w3.org/1999/02/22-rdf-syntax-ns#type": [ { "type" : "uri", "value" : "http://rdfs.org/sioc/ns#Usergroup" } ]
    },
    "http://groups.event-processing.org/id/MyGroupB#group" :
    {
        "http://purl.org/dc/elements/1.1/title": [ { "type" : "literal", "value" : "MyGroupB group" } ],
        "http://purl.org/dc/elements/1.1/description": [ { "type" : "literal", "value" : "The Play MyGroupB group" } ],
        "http://www.w3.org/2002/06/xhtml2/icon": [ { "type" : "uri", "value" : "http://s-static.ak.facebook.com/rsrc.php/yi/r/q9U99v3_saj.ico" } ],
        "http://www.w3.org/1999/02/22-rdf-syntax-ns#type": [ { "type" : "uri", "value" : "http://rdfs.org/sioc/ns#Usergroup" } ]
    },
    "http://streams.event-processing.org/ids/MyPersonalStream#stream" :
    {
        "http://purl.org/dc/elements/1.1/title": [ { "type" : "literal", "value" : "Facebook Status Feed" } ],
        "http://purl.org/dc/elements/1.1/description": [ { "type" : "literal", "value" : "A stream of Facebook Wall updates." } ],
        "http://www.w3.org/2002/06/xhtml2/icon": [ { "type" : "uri", "value" : "http://s-static.ak.facebook.com/rsrc.php/yi/r/q9U99v3_saj.ico" } ],
        "http://www.play-project.eu/xml/ns/topic":  [ { "type" : "uri" , "value" : "http://streams.event-processing.org/ids/FacebookStatusFeed" } ],
        "http://www.play-project.eu/xml/ns/topic/prefix":  [ { "type" : "literal" , "value" : "s" } ],
        "http://www.play-project.eu/xml/ns/topic/name":  [ { "type" : "literal" , "value" : "FacebookStatusFeed" } ],
        "http://www.play-project.eu/xml/ns/topic/ns":  [ { "type" : "uri" , "value" : "http://streams.event-processing.org/ids/" } ],
        "http://www.w3.org/1999/02/22-rdf-syntax-ns#type": [ { "type" : "uri", "value" : "http://events.event-processing.org/types/Stream" } ]
    },
    "http://permissions.event-processing.org/id/0000001" :
    {
        "http://www.w3.org/ns/auth/acl#accessTo": [ { "type" : "uri", "value" : "http://streams.event-processing.org/ids/MyPersonalStream" } ],
        "http://www.w3.org/ns/auth/acl#agent": [ { "type" : "uri", "value" : "http://groups.event-processing.org/id/MyGroupB#group" } ],
        "http://www.w3.org/ns/auth/acl#mode": [ { "type" : "uri", "value" : "http://docs.oasis-open.org/wsn/bw-2/NotificationConsumer/Notify" } ],
        "http://www.w3.org/ns/auth/acl#mode": [ { "type" : "uri", "value" : "http://docs.oasis-open.org/wsn/bw-2/NotificationProducer/SubscribeRequest" } ],
        "http://www.w3.org/ns/auth/acl#mode": [ { "type" : "uri", "value" : "http://www.w3.org/ns/auth/acl#Write" } ],
        "http://www.w3.org/ns/auth/acl#mode": [ { "type" : "uri", "value" : "http://www.w3.org/ns/auth/acl#Read" } ]
    }
}