Here is a basic document describing how a foaf:Person could trade its musical item (CD, MD, DVD-A, etc.) using the music ontology

=RDF/XML=

1   &lt;foaf:Person rdf:about="http://www.talkdigger.com/foaf/fgiasson"&gt; 2       &lt;foaf:nick&gt;fgiasson&lt;/foaf:nick&gt; 3       &lt;foaf:name&gt;Frederick Giasson&lt;/foaf:name&gt; 4       &lt;foaf:mbox_sha1sum&gt;bb81ecaac6992f832ea69313bd04d4fd9e2e4e0f&lt;/foaf:mbox_sha1sum&gt; 5       &lt;mo:has_item rdf:resource="http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431"/&gt; 6       &lt;mo:sell_item rdf:resource="http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431"/&gt; 7       &lt;mo:exchange_item rdf:resource="http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431"/&gt; 8       &lt;mo:want_item rdf:resource="http://zitgist.com/music/record/65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab"/&gt; 9   &lt;/foaf:Person&gt;

10   &lt;mo:Record rdf:about="http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431"&gt; 11       &lt;dc:title&gt;Kill 'em All&lt;/dc:title&gt; 12       &lt;dc:creator rdf:resource="http://zitgist.com/music/artist/65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab"/&gt; 13       &lt;dcterms:created&gt;1983-07-13T00:00:00Z&lt;/dcterms:created&gt; 14       &lt;mo:available_as rdf:resource="http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431" /&gt; 15       &lt;mo:release_type rdf:resource="http://purl.org/ontology/mo/album"/&gt; 16       &lt;mo:release_status rdf:resource="http://purl.org/ontology/mo/official"/&gt; 17       &lt;mo:image rdf:resource="http://ec1.images-amazon.com/images/P/B00000B9AN.01._AA180_SCLZZZZZZZ_.jpg"/&gt; 18       &lt;mo:amazon_asin rdf:resource="http://amazon.com/exec/obidos/ASIN/B00000B9AN/"/&gt; 19       &lt;mo:track rdf:resource="http://zitgist.com/music/track/8467f4e7-ef5b-458c-bbc5-6727d9f2252d" mo:track_number="1"/&gt;

20       ...

21       &lt;mo:track rdf:resource="http://zitgist.com/music/track/833bcfc4-8c89-49d8-be52-4eb926b48ab0" mo:track_number="10"/&gt; 22   &lt;/mo:Record&gt;

23   &lt;mo:Cd rdf:about="http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431"&gt; 24   	&lt;dc:title&gt; My Kill'Em'All CD &lt;/dc:title&gt; 25   	&lt;dc:description&gt; It is in good overall shape, except a small scratch on track 3&lt;/dc:description&gt; 26   &lt;/mo:Cd&gt;

=RDF/N3=

1   @prefix sim: &lt;http://purl.org/ontology/sim/&gt;. 2   @prefix foaf: &lt;http://xmlns.com/foaf/0.1/&gt;. 3   @prefix mo: &lt;http://purl.org/ontology/mo/&gt;. 4   @prefix dcterms: &lt;http://purl.org/dc/terms/&gt;. 5   @prefix rel: &lt;http://purl.org/vocab/relationship/&gt;. 6   @prefix time: &lt;http://www.w3.org/TR/owl-time/&gt;. 7   @prefix dc: &lt;http://purl.org/dc/elements/1.1/&gt;. 8   @prefix timeline: &lt;http://purl.org/NET/c4dm/timeline.owl#&gt;. 9   @prefix rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt;. 10   &lt;http://www.talkdigger.com/foaf/fgiasson&gt; rdf:type foaf:Person ; 11   	foaf:nick "fgiasson" ; 12   	foaf:name "Frederick Giasson" ; 13   	foaf:mbox_sha1sum "bb81ecaac6992f832ea69313bd04d4fd9e2e4e0f" ; 14   	mo:has_item &lt;http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431&gt; ; 15   	mo:sell_item &lt;http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431&gt; ; 16   	mo:exchange_item &lt;http://zitgist.com/music/record/a89e1d92-5381-4dab-ba51-733137d0e431&gt; ; 17   	mo:want_item &lt;http://zitgist.com/music/record/65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab&gt;. 18   &lt;http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431&gt; rdf:type mo:Record ; 19   	mo:title "Kill 'em All" ; 20   	dc:creator &lt;http://zitgist.com/music/artist/65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab&gt; ; 21   	dcterms:created "1983-07-13T00:00:00Z" ; 22   	mo:available_as &lt;http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431&gt; ; 23   	mo:release_type mo:album ; 24   	mo:release_status mo:official ; 25   	mo:image &lt;http://ec1.images-amazon.com/images/P/B00000B9AN.01._AA180_SCLZZZZZZZ_.jpg&gt; ; 26   	mo:amazon_asin &lt;http://amazon.com/exec/obidos/ASIN/B00000B9AN/&gt;. 27   &lt;http://zitgist.com/music/track/8467f4e7-ef5b-458c-bbc5-6727d9f2252d&gt; mo:track_number "1". 28   &lt;http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431&gt; mo:track &lt;http://zitgist.com/music/track/8467f4e7-ef5b-458c-bbc5-6727d9f2252d&gt;. 29   &lt;http://zitgist.com/music/track/833bcfc4-8c89-49d8-be52-4eb926b48ab0&gt; mo:track_number "10". 30   &lt;http://zitgist.com/music/cd/a89e1d92-5381-4dab-ba51-733137d0e431&gt; mo:track &lt;http://zitgist.com/music/track/833bcfc4-8c89-49d8-be52-4eb926b48ab0&gt; ; 31   	rdf:type mo:Cd ; 32   	dc:title " My Kill'Em'All CD " ; 33   	dc:description " It is in good overall shape, except a small scratch on track 3".