Reference : REST RDF API reference : REST Operations : Parameters : Modified since
  
Modified since
Use the modifiedSince parameter to list only the elements that are modified after the entered time value.
Parameter value: time as xsd:date or xsd:dateTime
Can be used with: Module (Element collection) resource
Applicable: HTTP GET
For example:
http://fpserver/fp/resources/workspaces/2/modules/1.rdf? modifiedSince=2012-06-11T09:56:48.128Z
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Parameters