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   XML ATTRIBUTES : Are they attribute Names or Type Names?

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  • From: Mark Tucker <mct@foyt.indyrad.iupui.edu>
  • To: David Rosenborg <David.Rosenborg@xsse.se>
  • Date: Mon, 31 Aug 1998 14:25:28 -0500 (EST)

Hi David,

	I'm not sure what you said about typenames and attribute
names, but I wonder if it is this problem. XML ELEMENT names are
confused about whether they are acting as programming language "type
names", or as programming language "field names".

In a "data oriented schema" (aka, Type Definition Language)
we might write

    x : INT
    y : INT
    lower-left : POINT
    upper-right : POINT

and then we might have instances:

<POINT>		-- Point is the Type Name
  <x>3</x>	-- X is a field name

<RECTANGLE>	-- type
  <lower-left>		-- field
      <POINT>		-- type
      	  <x>3</x>	-- field

    Programming languages make it clear when an identifier defines a
type (POINT), and when it uses a type (lower-left).

-- Mark

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