The eLandings schema changes over time . As of schema version 1.1, eLandings objects that are subject to schema versioning include the <schema_version> element. Software sending XML representations of eLandings objects must specify into which schema version their object was marshalled; software consuming XML representations of eLandings objects may search the XML string for this markup, and pre-process the XML if necessary before unmarshalling using whichever schema that software is built to accept.
...