////////////////////////////////////////////////////////////////////////////////
/// @brief over the wire protocol
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2012 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @page RestEdgeTOC
///
/// <ul>
///  <li>@ref RestEdge
///   <ul>
///    <li>@ref RestEdgeIntro</li>
///    <li>@ref RestEdgeResource</li>
///    <li>@ref RestEdgeHttp
///     @copydetails RestEdgeCallsTOC
///    </li>
///   </ul>
///  </li>
/// </ul>
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @page RestEdgeCallsTOC
///
/// <ul>
///  <li>@ref RestEdgeRead "GET /_api/edge/document-handle"</li>
///  <li>@ref RestEdgeCreate "POST /_api/edge?collection=collection-identifier&from=from-handle&to=to-handle"</li>
///  <li>@ref RestEdgeUpdate "PUT /_api/edge/document-handle"</li>
///  <li>@ref RestEdgeDelete "DELETE /_api/edge/document-handle"</li>
///  <li>@ref RestEdgeHead "HEAD /_api/edge/document-handle"</li>
///  <li>@ref RestEdgeEdges "GET /_api/edges/collection-identifier?vertex=vertex-handle&directory=direction"</li>
/// </ul>
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @page RestEdge REST Interface for Edges
///
/// This is an introduction to ArangoDB's REST interface for edges.
///
/// AvocacadoDB offers also some graph functionality. A graph consists of nodes,
/// edges and properties. ArangoDB stores the information how the nodes relate
/// to each other aside from the properties.
///
/// So a graph data model always consists of two collections: the relations
/// between the nodes in the graphs are stored in an "edges collection", the
/// nodes in the graph are stored in documents in regular collections.
///
/// Example:
/// - the edge collection stores the information that a company's reception is
///   sub-unit to the services unit and the services unit is sub-unit to the
///   CEO. You would express this relationship with the @LIT{_from} and
///   @LIT{_to} property
///
/// - the "normal" collection stores all the properties about the reception,
///   e.g. that 20 people are working there and the room number etc.
///
/// @LIT{_from} is the document handle of the linked vertex (incoming relation),
/// @LIT{_to} is the document handle of the linked vertex (outgoing relation).
///
/// @EMBEDTOC{RestEdgeTOC}
///
/// @section RestEdgeIntro Documents, Identifiers, Handles
//////////////////////////////////////////////////////////////
///
/// @copydoc GlossaryEdge
///
/// @section RestEdgeResource Address and ETag of an Edge
/////////////////////////////////////////////////////////
///
/// All documents in ArangoDB have a document handle. This handle uniquely
/// defines a document and is managed by ArangoDB. All documents are
/// found under the URI
///
/// @LIT{http://@FA{server}:@FA{port}/_api/document/@FA{document-handle}}
///
/// For edges you can use the special address
///
/// @LIT{http://@FA{server}:@FA{port}/_api/edge/@FA{document-handle}}
///
/// For example: Assume that the document handle, which is stored in
/// the @LIT{_id} field of the edge, is @LIT{7254820/362549736},
/// then the URL of that edge is:
///
/// @LIT{http://localhost:8529/_api/edge/7254820/362549736}
///
/// @section RestEdgeHttp Working with Edges using REST
///////////////////////////////////////////////////////
///
/// @anchor RestEdgeRead
////////////////////////
/// @RESTHEADER{GET /_api/edge,reads an edge}
///
/// @REST{GET /_api/edge/@FA{document-handle}}
///
/// See @ref RestDocument for details.
///
/// @anchor RestEdgeCreate
//////////////////////////
/// @copydetails triagens::arango::RestEdgeHandler::createDocument
///
/// @anchor RestEdgeUpdate
//////////////////////////
/// @RESTHEADER{PUT /_api/edge,updates an edge}
///
/// @REST{PUT /_api/edge/@FA{document-handle}}
///
/// See @ref RestDocument for details.
///
/// @anchor RestEdgeDelete
//////////////////////////
/// @RESTHEADER{DELETE /_api/edge,deletes an edge}
///
/// @REST{DELETE /_api/edge/@FA{document-handle}}
///
/// See @ref RestDocument for details.
///
/// @anchor RestEdgeHead
////////////////////////
/// @RESTHEADER{GET /_api/edge,reads an edge header}
///
/// @REST{HEAD /_api/edge/@FA{document-handle}}
///
/// See @ref RestDocument for details.
///
/// @anchor RestEdgeEdges
/////////////////////////
/// @copydetails JSF_GET_edges
////////////////////////////////////////////////////////////////////////////////

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