diff --git a/backend/saveSvg.php b/backend/saveSvg.php
index 829d31c..b3e8f24 100644
--- a/backend/saveSvg.php
+++ b/backend/saveSvg.php
@@ -8,7 +8,7 @@ $name  = $_GET["name"];
 if (isValidName($name))
 {
     $imageFilename = getSvgFileName($name);
-    $svgData     = $_POST['svgdata'];
+    $svgData     = file_get_contents('php://input');
     
     file_put_contents($imageFilename, $svgData);
     
diff --git a/core/config/main.php b/core/config/main.php
index c8208f5..ad66522 100755
--- a/core/config/main.php
+++ b/core/config/main.php
@@ -93,5 +93,5 @@
     $g_config['vote']                   = "./tmp/vote/vote.txt";
     $g_config['voteTopics']             = "./tmp/vote/voteTopics.txt_";
     $g_config['use_js_cache']           = true;
-    $g_config['engine_version']         = 87;
+    $g_config['engine_version']         = 88;
 ?>
diff --git a/script/pages/create_graph_by_edge_list/api/index.js.cache b/script/pages/create_graph_by_edge_list/api/index.js.cache
index 5ee5484..2345050 100644
--- a/script/pages/create_graph_by_edge_list/api/index.js.cache
+++ b/script/pages/create_graph_by_edge_list/api/index.js.cache
@@ -1,4 +1,4 @@
-moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=87","/script/shared/point.js?v=87","/script/entities/edge/api/index.js?v=87","/script/entities/edge/model/BaseEdge.js?v=87","/script/entities/edge/model/EdgeModel.js?v=87","/script/entities/vertex/api/index.js?v=87","/script/entities/vertex/model/BaseVertex.js?v=87","/script/entities/vertex/model/VertexModel.js?v=87","/script/entities/graph/model/Graph.js?v=87",]);{let modulDir="pages/create_graph_by_edge_list/";doInclude([include("entities/graph/api/index.js")]);}
+moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=88","/script/shared/point.js?v=88","/script/entities/edge/api/index.js?v=88","/script/entities/edge/model/BaseEdge.js?v=88","/script/entities/edge/model/EdgeModel.js?v=88","/script/entities/vertex/api/index.js?v=88","/script/entities/vertex/model/BaseVertex.js?v=88","/script/entities/vertex/model/VertexModel.js?v=88","/script/entities/graph/model/Graph.js?v=88",]);{let modulDir="pages/create_graph_by_edge_list/";doInclude([include("entities/graph/api/index.js")]);}
 {let modulDir="entities/graph/";doInclude([include("shared/point.js"),include("entities/edge/api/index.js"),include("entities/vertex/api/index.js"),include("model/Graph.js",modulDir)])}function Point(x,y){this.x=x||0;this.y=y||0;};Point.prototype.x=null;Point.prototype.y=null;Point.prototype.add=function(v){return new Point(this.x+v.x,this.y+v.y);};Point.prototype.addValue=function(v){return new Point(this.x+v,this.y+v);};Point.prototype.clone=function(){return new Point(this.x,this.y);};Point.prototype.degreesTo=function(v){var dx=this.x-v.x;var dy=this.y-v.y;var angle=Math.atan2(dy,dx);return angle*(180/Math.PI);};Point.prototype.distance=function(v){return Math.sqrt(this.distanceSqr(v));};Point.prototype.distanceSqr=function(v){var x=this.x-v.x;var y=this.y-v.y;return x*x+y*y;};Point.prototype.equals=function(toCompare){return this.x==toCompare.x&&this.y==toCompare.y;};Point.prototype.interpolate=function(v,f){return new Point((this.x+v.x)*f,(this.y+v.y)*f);};Point.prototype.length=function(){return Math.sqrt(this.x*this.x+this.y*this.y);};Point.prototype.normalize=function(thickness){var l=this.length();this.x=this.x/l*thickness;this.y=this.y/l*thickness;return new Point(this.x,this.y);};Point.prototype.normalizeCopy=function(thickness){var l=this.length();return new Point(this.x/l*thickness,this.y/l*thickness);};Point.prototype.orbit=function(origin,arcWidth,arcHeight,degrees){var radians=degrees*(Math.PI/180);this.x=origin.x+arcWidth*Math.cos(radians);this.y=origin.y+arcHeight*Math.sin(radians);};Point.prototype.rotate=function(center,degrees){var radians=degrees*(Math.PI/180);offset=this.subtract(center);this.x=offset.x*Math.cos(radians)-offset.y*Math.sin(radians);this.y=offset.x*Math.sin(radians)+offset.y*Math.cos(radians);this.x=this.x+center.x;this.y=this.y+center.y;return this;};Point.prototype.offset=function(dx,dy){this.x+=dx;this.y+=dy;};Point.prototype.subtract=function(v){return new Point(this.x-v.x,this.y-v.y);};Point.prototype.subtractValue=function(value){return new Point(this.x-value,this.y-value);};Point.prototype.multiply=function(value){return new Point(this.x*value,this.y*value);};Point.prototype.toString=function(){return"(x="+this.x+", y="+this.y+")";};Point.prototype.normal=function(){return new Point(-this.y,this.x);};Point.prototype.min=function(point)
 {return new Point(Math.min(this.x,point.x),Math.min(this.y,point.y));};Point.prototype.max=function(point)
 {return new Point(Math.max(this.x,point.x),Math.max(this.y,point.y));};Point.prototype.inverse=function()
diff --git a/script/pages/create_graph_by_incidence_matrix/api/index.js.cache b/script/pages/create_graph_by_incidence_matrix/api/index.js.cache
index daa2652..4dfbede 100644
--- a/script/pages/create_graph_by_incidence_matrix/api/index.js.cache
+++ b/script/pages/create_graph_by_incidence_matrix/api/index.js.cache
@@ -1,4 +1,4 @@
-moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=87","/script/shared/point.js?v=87","/script/entities/edge/api/index.js?v=87","/script/entities/edge/model/BaseEdge.js?v=87","/script/entities/edge/model/EdgeModel.js?v=87","/script/entities/vertex/api/index.js?v=87","/script/entities/vertex/model/BaseVertex.js?v=87","/script/entities/vertex/model/VertexModel.js?v=87","/script/entities/graph/model/Graph.js?v=87",]);{let modulDir="pages/create_graph_by_matrix/";doInclude([include("entities/graph/api/index.js")]);}
+moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=88","/script/shared/point.js?v=88","/script/entities/edge/api/index.js?v=88","/script/entities/edge/model/BaseEdge.js?v=88","/script/entities/edge/model/EdgeModel.js?v=88","/script/entities/vertex/api/index.js?v=88","/script/entities/vertex/model/BaseVertex.js?v=88","/script/entities/vertex/model/VertexModel.js?v=88","/script/entities/graph/model/Graph.js?v=88",]);{let modulDir="pages/create_graph_by_matrix/";doInclude([include("entities/graph/api/index.js")]);}
 {let modulDir="entities/graph/";doInclude([include("shared/point.js"),include("entities/edge/api/index.js"),include("entities/vertex/api/index.js"),include("model/Graph.js",modulDir)])}function Point(x,y){this.x=x||0;this.y=y||0;};Point.prototype.x=null;Point.prototype.y=null;Point.prototype.add=function(v){return new Point(this.x+v.x,this.y+v.y);};Point.prototype.addValue=function(v){return new Point(this.x+v,this.y+v);};Point.prototype.clone=function(){return new Point(this.x,this.y);};Point.prototype.degreesTo=function(v){var dx=this.x-v.x;var dy=this.y-v.y;var angle=Math.atan2(dy,dx);return angle*(180/Math.PI);};Point.prototype.distance=function(v){return Math.sqrt(this.distanceSqr(v));};Point.prototype.distanceSqr=function(v){var x=this.x-v.x;var y=this.y-v.y;return x*x+y*y;};Point.prototype.equals=function(toCompare){return this.x==toCompare.x&&this.y==toCompare.y;};Point.prototype.interpolate=function(v,f){return new Point((this.x+v.x)*f,(this.y+v.y)*f);};Point.prototype.length=function(){return Math.sqrt(this.x*this.x+this.y*this.y);};Point.prototype.normalize=function(thickness){var l=this.length();this.x=this.x/l*thickness;this.y=this.y/l*thickness;return new Point(this.x,this.y);};Point.prototype.normalizeCopy=function(thickness){var l=this.length();return new Point(this.x/l*thickness,this.y/l*thickness);};Point.prototype.orbit=function(origin,arcWidth,arcHeight,degrees){var radians=degrees*(Math.PI/180);this.x=origin.x+arcWidth*Math.cos(radians);this.y=origin.y+arcHeight*Math.sin(radians);};Point.prototype.rotate=function(center,degrees){var radians=degrees*(Math.PI/180);offset=this.subtract(center);this.x=offset.x*Math.cos(radians)-offset.y*Math.sin(radians);this.y=offset.x*Math.sin(radians)+offset.y*Math.cos(radians);this.x=this.x+center.x;this.y=this.y+center.y;return this;};Point.prototype.offset=function(dx,dy){this.x+=dx;this.y+=dy;};Point.prototype.subtract=function(v){return new Point(this.x-v.x,this.y-v.y);};Point.prototype.subtractValue=function(value){return new Point(this.x-value,this.y-value);};Point.prototype.multiply=function(value){return new Point(this.x*value,this.y*value);};Point.prototype.toString=function(){return"(x="+this.x+", y="+this.y+")";};Point.prototype.normal=function(){return new Point(-this.y,this.x);};Point.prototype.min=function(point)
 {return new Point(Math.min(this.x,point.x),Math.min(this.y,point.y));};Point.prototype.max=function(point)
 {return new Point(Math.max(this.x,point.x),Math.max(this.y,point.y));};Point.prototype.inverse=function()
diff --git a/script/pages/create_graph_by_matrix/api/index.js.cache b/script/pages/create_graph_by_matrix/api/index.js.cache
index f671a6b..030384e 100644
--- a/script/pages/create_graph_by_matrix/api/index.js.cache
+++ b/script/pages/create_graph_by_matrix/api/index.js.cache
@@ -1,4 +1,4 @@
-moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=87","/script/shared/point.js?v=87","/script/entities/edge/api/index.js?v=87","/script/entities/edge/model/BaseEdge.js?v=87","/script/entities/edge/model/EdgeModel.js?v=87","/script/entities/vertex/api/index.js?v=87","/script/entities/vertex/model/BaseVertex.js?v=87","/script/entities/vertex/model/VertexModel.js?v=87","/script/entities/graph/model/Graph.js?v=87","/script/pages/create_graph_by_matrix/model/createByMatrixMain.js?v=87","/script/pages/create_graph_by_matrix/model/main.js?v=87",]);{let modulDir="pages/create_graph_by_matrix/";doInclude([include("entities/graph/api/index.js"),include("model/createByMatrixMain.js",modulDir),include("model/main.js",modulDir)]);}
+moduleLoader.beginCacheLoading(["/script/entities/graph/api/index.js?v=88","/script/shared/point.js?v=88","/script/entities/edge/api/index.js?v=88","/script/entities/edge/model/BaseEdge.js?v=88","/script/entities/edge/model/EdgeModel.js?v=88","/script/entities/vertex/api/index.js?v=88","/script/entities/vertex/model/BaseVertex.js?v=88","/script/entities/vertex/model/VertexModel.js?v=88","/script/entities/graph/model/Graph.js?v=88","/script/pages/create_graph_by_matrix/model/createByMatrixMain.js?v=88","/script/pages/create_graph_by_matrix/model/main.js?v=88",]);{let modulDir="pages/create_graph_by_matrix/";doInclude([include("entities/graph/api/index.js"),include("model/createByMatrixMain.js",modulDir),include("model/main.js",modulDir)]);}
 {let modulDir="entities/graph/";doInclude([include("shared/point.js"),include("entities/edge/api/index.js"),include("entities/vertex/api/index.js"),include("model/Graph.js",modulDir)])}function Point(x,y){this.x=x||0;this.y=y||0;};Point.prototype.x=null;Point.prototype.y=null;Point.prototype.add=function(v){return new Point(this.x+v.x,this.y+v.y);};Point.prototype.addValue=function(v){return new Point(this.x+v,this.y+v);};Point.prototype.clone=function(){return new Point(this.x,this.y);};Point.prototype.degreesTo=function(v){var dx=this.x-v.x;var dy=this.y-v.y;var angle=Math.atan2(dy,dx);return angle*(180/Math.PI);};Point.prototype.distance=function(v){return Math.sqrt(this.distanceSqr(v));};Point.prototype.distanceSqr=function(v){var x=this.x-v.x;var y=this.y-v.y;return x*x+y*y;};Point.prototype.equals=function(toCompare){return this.x==toCompare.x&&this.y==toCompare.y;};Point.prototype.interpolate=function(v,f){return new Point((this.x+v.x)*f,(this.y+v.y)*f);};Point.prototype.length=function(){return Math.sqrt(this.x*this.x+this.y*this.y);};Point.prototype.normalize=function(thickness){var l=this.length();this.x=this.x/l*thickness;this.y=this.y/l*thickness;return new Point(this.x,this.y);};Point.prototype.normalizeCopy=function(thickness){var l=this.length();return new Point(this.x/l*thickness,this.y/l*thickness);};Point.prototype.orbit=function(origin,arcWidth,arcHeight,degrees){var radians=degrees*(Math.PI/180);this.x=origin.x+arcWidth*Math.cos(radians);this.y=origin.y+arcHeight*Math.sin(radians);};Point.prototype.rotate=function(center,degrees){var radians=degrees*(Math.PI/180);offset=this.subtract(center);this.x=offset.x*Math.cos(radians)-offset.y*Math.sin(radians);this.y=offset.x*Math.sin(radians)+offset.y*Math.cos(radians);this.x=this.x+center.x;this.y=this.y+center.y;return this;};Point.prototype.offset=function(dx,dy){this.x+=dx;this.y+=dy;};Point.prototype.subtract=function(v){return new Point(this.x-v.x,this.y-v.y);};Point.prototype.subtractValue=function(value){return new Point(this.x-value,this.y-value);};Point.prototype.multiply=function(value){return new Point(this.x*value,this.y*value);};Point.prototype.toString=function(){return"(x="+this.x+", y="+this.y+")";};Point.prototype.normal=function(){return new Point(-this.y,this.x);};Point.prototype.min=function(point)
 {return new Point(Math.min(this.x,point.x),Math.min(this.y,point.y));};Point.prototype.max=function(point)
 {return new Point(Math.max(this.x,point.x),Math.max(this.y,point.y));};Point.prototype.inverse=function()
diff --git a/script/pages/editor/api/index.js.cache b/script/pages/editor/api/index.js.cache
index 3beb836..cc6dbaf 100644
--- a/script/pages/editor/api/index.js.cache
+++ b/script/pages/editor/api/index.js.cache
@@ -1,4 +1,4 @@
-moduleLoader.beginCacheLoading(["/script/shared/utils.js?v=87","/script/entities/graph/api/index.js?v=87","/script/shared/point.js?v=87","/script/entities/edge/api/index.js?v=87","/script/entities/edge/model/BaseEdge.js?v=87","/script/entities/edge/model/EdgeModel.js?v=87","/script/entities/vertex/api/index.js?v=87","/script/entities/vertex/model/BaseVertex.js?v=87","/script/entities/vertex/model/VertexModel.js?v=87","/script/entities/graph/model/Graph.js?v=87","/script/features/draw_graph/api/index.js?v=87","/script/features/draw_graph/model/BaseBackgroundDrawer.js?v=87","/script/features/draw_graph/model/EdgeStyle.js?v=87","/script/features/draw_graph/model/BaseEdgeDrawer.js?v=87","/script/features/draw_graph/model/VertexShape.js?v=87","/script/features/draw_graph/model/VertexStyle.js?v=87","/script/features/draw_graph/model/BaseVertexDrawer.js?v=87","/script/features/algorithms/api/index.js?v=87","/script/features/algorithms/model/Algorithms.js?v=87","/script/features/algorithms/model/BaseTraversal.js?v=87","/script/features/base_handler/index.js?v=87","/script/features/default_handler/index.js?v=87","/script/features/add_vertices_handler/index.js?v=87","/script/features/connect_vertices_handler/index.js?v=87","/script/features/delete_objects_handler/index.js?v=87","/script/features/algorithm_handler/index.js?v=87","/script/features/serialization/api/index.js?v=87","/script/features/serialization/model/GraphMLCreator.js?v=87","/script/features/enum_vertices/EnumVertices.js?v=87","/script/pages/editor/model/texts.js?v=87","/script/pages/editor/model/UndoStack.js?v=87","/script/pages/editor/model/DiskSaveLoad.js?v=87","/script/pages/editor/model/Application.js?v=87","/script/pages/editor/ui/ya_metrika.js?v=87","/script/pages/editor/ui/editor.js?v=87","/script/pages/editor/ui/main.js?v=87",]);{function onloadEditor(){console.log("onload() call");doIncludeAsync([include("shared/canvas2svg.js"),include("features/group_rename_handler/index.js"),include("features/saved_graph_handler/index.js"),include("features/saved_graph_image_handler/index.js"),include("features/show_adjacency_matrix/index.js"),include("features/show_distance_matrix/index.js"),include("features/show_incidence_matrix/index.js"),include("features/setup_background_style/index.js"),include("features/setup_edge_style/index.js"),include("features/setup_vertex_style/index.js"),]);postLoadPage();}
+moduleLoader.beginCacheLoading(["/script/shared/utils.js?v=88","/script/entities/graph/api/index.js?v=88","/script/shared/point.js?v=88","/script/entities/edge/api/index.js?v=88","/script/entities/edge/model/BaseEdge.js?v=88","/script/entities/edge/model/EdgeModel.js?v=88","/script/entities/vertex/api/index.js?v=88","/script/entities/vertex/model/BaseVertex.js?v=88","/script/entities/vertex/model/VertexModel.js?v=88","/script/entities/graph/model/Graph.js?v=88","/script/features/draw_graph/api/index.js?v=88","/script/features/draw_graph/model/BaseBackgroundDrawer.js?v=88","/script/features/draw_graph/model/EdgeStyle.js?v=88","/script/features/draw_graph/model/BaseEdgeDrawer.js?v=88","/script/features/draw_graph/model/VertexShape.js?v=88","/script/features/draw_graph/model/VertexStyle.js?v=88","/script/features/draw_graph/model/BaseVertexDrawer.js?v=88","/script/features/algorithms/api/index.js?v=88","/script/features/algorithms/model/Algorithms.js?v=88","/script/features/algorithms/model/BaseTraversal.js?v=88","/script/features/base_handler/index.js?v=88","/script/features/default_handler/index.js?v=88","/script/features/add_vertices_handler/index.js?v=88","/script/features/connect_vertices_handler/index.js?v=88","/script/features/delete_objects_handler/index.js?v=88","/script/features/algorithm_handler/index.js?v=88","/script/features/serialization/api/index.js?v=88","/script/features/serialization/model/GraphMLCreator.js?v=88","/script/features/enum_vertices/EnumVertices.js?v=88","/script/pages/editor/model/texts.js?v=88","/script/pages/editor/model/UndoStack.js?v=88","/script/pages/editor/model/DiskSaveLoad.js?v=88","/script/pages/editor/model/Application.js?v=88","/script/pages/editor/ui/ya_metrika.js?v=88","/script/pages/editor/ui/editor.js?v=88","/script/pages/editor/ui/main.js?v=88",]);{function onloadEditor(){console.log("onload() call");doIncludeAsync([include("shared/canvas2svg.js"),include("features/group_rename_handler/index.js"),include("features/saved_graph_handler/index.js"),include("features/saved_graph_image_handler/index.js"),include("features/show_adjacency_matrix/index.js"),include("features/show_distance_matrix/index.js"),include("features/show_incidence_matrix/index.js"),include("features/setup_background_style/index.js"),include("features/setup_edge_style/index.js"),include("features/setup_vertex_style/index.js"),]);postLoadPage();}
 let modulDir="pages/editor/";doInclude([include("shared/utils.js"),include("entities/graph/api/index.js"),include("features/draw_graph/api/index.js"),include("features/algorithms/api/index.js"),include("features/base_handler/index.js"),include("features/default_handler/index.js"),include("features/add_vertices_handler/index.js"),include("features/connect_vertices_handler/index.js"),include("features/delete_objects_handler/index.js"),include("features/algorithm_handler/index.js"),include("features/serialization/api/index.js"),include("features/enum_vertices/EnumVertices.js"),include("model/texts.js",modulDir),include("model/UndoStack.js",modulDir),include("model/DiskSaveLoad.js",modulDir),include("model/Application.js",modulDir),include("ui/ya_metrika.js",modulDir),include("ui/editor.js",modulDir),include("ui/main.js",modulDir)],onloadEditor);}
 function gEncodeToHTML(str)
 {if(typeof str!=='string')
@@ -1366,7 +1366,7 @@ UndoStack.prototype.IsUndoStackEmpty=function()
 var DiskSaveLoad=function(){};DiskSaveLoad.LoadGraphFromDisk=function(graphName,callback)
 {$.ajax({type:"GET",url:"/"+SiteDir+"backend/loadGraph.php?name="+graphName}).done(callback);}
 DiskSaveLoad.SaveSVGGraphOnDisk=function(imageName,svgText,callback)
-{$.ajax({type:"POST",url:"/"+SiteDir+"backend/saveSvg.php?name="+imageName,data:{svgdata:svgText},dataType:"text",success:callback});return imageName;}
+{$.ajax({type:"POST",url:"/"+SiteDir+"backend/saveSvg.php?name="+imageName,data:svgText,dataType:"text",contentType:"text/xml; charset=utf-8",success:callback});return imageName;}
 DiskSaveLoad.SaveGraphOnDisk=function(savedGraphName,graphAsString,callback)
 {$.ajax({type:"POST",url:"/"+SiteDir+"backend/saveGraph.php?name="+savedGraphName,data:graphAsString,dataType:"text"}).done(callback);}
 DiskSaveLoad.SaveGraphImageOnDisk=function(imageName,rectParams,imageBase64Data,callback)
diff --git a/script/pages/editor/model/DiskSaveLoad.js b/script/pages/editor/model/DiskSaveLoad.js
index b56fba9..b9f9c9a 100644
--- a/script/pages/editor/model/DiskSaveLoad.js
+++ b/script/pages/editor/model/DiskSaveLoad.js
@@ -17,10 +17,9 @@ DiskSaveLoad.SaveSVGGraphOnDisk = function (imageName, svgText, callback)
     $.ajax({
      type: "POST",
      url: "/" + SiteDir + "backend/saveSvg.php?name=" + imageName,
-     data: {
-           svgdata : svgText
-     },
+     data: svgText,
      dataType: "text",
+     contentType: "text/xml; charset=utf-8",
      success: callback
      });