XML Data Model

• Based on directed graph

• Vertices
  • elements (type=element, value=vertex objectid)
  • data values (type, value)

• Edges
  • element containment (parent, child, name, type=E)
  • attributes (parent, child, name, type=A)
  • references (parent, child, refedges, type=Rx (x=ID, ...))

• Order Relation (current, successor)

• Similar to Infoset:
  • reference information item
  • no unresolved entity support

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