More additions about SdrView / SdrModel.

Change-Id: I2178d61af1f49c971ccec817852260020ec8f0aa

svx/README

@@ -32,8 +32,24 @@ SdrObject <- SdrAttrObj <- E3dObject <- E3dCompoundObject <- E3dCubeObj
 
 The above is incomplete of course.
 
-Associated are the SdrPaintView's - they have quite a deep chain of
-inheritance, where each new class adds a bit of functionality:
+== SdrModel / SdrView ==
+
+Copied from svdview.hxx:
+
+  First of all the app creates a SdrModel.
+  Then it opens a Win and creates a SdrView.
+  ShowSdrPage() announces a page at SdrView.
+  It's possible to show SdrView in any Wins at once.
+
+  SdrView can show as many Wins as it wants at once. Pages are announced
+  or checked out with the help of ShowSdrPage()/HideSdrPage(). For every announced
+  page there is a SdrPageView instance in container aPages. If more than one page
+  is showed, you have to pay attention that the offset parameter of ShowSdrPage()
+  is conformed to the size of the page (to prevent overlapping of two pages).
+
+SdrView itself is inherited from many objects in a chain of inheritance (all
+that starts with SdrPaintView - that is itself inherited from few classes
+too):
 
 SdrPaintView <- SdrSnapView <- SdrMarkView <- SdrEditView <- SdrPolyEditView
                                                                    ^