The identifier of an XML document used in communications with the CMS.
A remote document identifier is used for all communications with the CMS relating to that document, for example when saving, loading, or browsing assets.
The RemoteDocumentId is always determined by the CMS and could be anything (for example
guid-7427-ad42-6000). In this way it is distinctly different from a DocumentId, which is an identifier determined by Fonto and only used internally.