Hi Gordon, The source attribute is used to point to additional data related to the feature element. It could be a document, image, web site URL or just about any other reference. Nathan Crews www.landxml.org -----Original Message----- From: landxml-bounce@xxxxxxxxxxxxx [mailto:landxml-bounce@xxxxxxxxxxxxx] On Behalf Of Gordan Vosicki Sent: Wednesday, September 16, 2009 11:27 AM To: landxml@xxxxxxxxxxxxx Subject: [LandXML] [Fwd: Feature source] Hi Nathan, What does actually the "source" attribute of the "Feature" element represent ? Is it meant to differentiate features from different providers/applications which might have the same code ? If yes, is there a prefix registry or or some good practice rules about how to use it ? Best regards, Gordan