ePlan files are XML files. The underlying schema used is LandXML, an internationally recognised XML schema available from LandXML.org. The ePlan Protocol uses a cut down version of LandXML specifically for Australia and New Zealand known as the ePlan Protocol Schema. The accompanying ePlan Protocol documentation is available from http://icsm-eplan.govspace.gov.au/eplan-protocol/. The diagram below from ICSM shows how the various Protocol components relate to each other. Boxes on the right represent XML schema files. The middle and left boxes represent specification documents that accompany the schema files.
Each jurisdiction provides a specialised version of the ePlan Protocol Schema specific to their jurisdictional requirements. Victoria's specialised ePlan schema and accompanying documentation are equivalent to the Jurisdictional Domain section in the above diagram.
Victoria implements a jurisdictional enumerations schema to go with the Victorian ePlan Protocol schema. It is split into two files for version management: