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2.3.1 Parts and Documents

   Every document consists of one or more parts, a single part at its top 
   level, called the root part, and other parts that are embedded in the root 
   part.  Documents always reside on the desktop or in a folder.  (Parts 
   embedded inside other parts aren't considered to be documents.)  Users 
   assemble a document by embedding parts as needed, with drag and drop or 
   with the Paste and Insert commands, as we'll see later.  Parts can be 
   dragged between documents or onto the desktop (where they become 
   documents); documents can be dragged from the desktop into other documents 
   (where they become embedded parts). 

   The root part of a document determines the document's overall 
   characteristics such as its basic editing metaphor (for instance, text, 
   drawing, or spreadsheet), the size of its work area (its page), its 
   printing options, and whether saving is manual or automatic.  Parts in an 
   OpenDoc document are in a hierarchical arrangement to each other.  The 
   logical structure of a document underlying its graphical presentation, 
   consists of the embedding relationships among its parts and their frames. 
   The embedding relationship can be displayed in the tree view of the 
   document as shown in Figure 10. 


 


                                              



 
   Figure 10. OpenDoc Part Hierarchy 

   In this example a text component embedded in a PageLayout component has 
   embedded two other components, a component called TestContainer and a 
   graphic component called 2DGraphicsPart. 

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