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 * License.
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 * The Original Code is Mozilla Communicator client code.
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#ifndef nsINameSpace_h___
#define nsINameSpace_h___

#include "nsISupports.h"

class nsIAtom;
class nsString;

#define NS_INAMESPACE_IID \
  { 0xa6cf90d4, 0x15b3, 0x11d2, \
    {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}


/**
 * A nsINameSpace registers the NameSpace URI with the NameSpaceManager
 * (creating or finding an ID), and manages the relationship between
 * the NameSpace ID and the (optional) Prefix.
 *
 * New NameSpaces are created as a child of an existing NameSpace. Searches
 * for NameSpaces based on prefix search up the chain of nested NameSpaces
 *
 * Each NameSpace keeps a live reference on its parent.
 *
 */
class nsINameSpace : public nsISupports {
public:
  NS_DEFINE_STATIC_IID_ACCESSOR(NS_INAMESPACE_IID)

  // Get data of this name space
  NS_IMETHOD GetNameSpaceID(PRInt32* aID) const = 0;
  NS_IMETHOD GetNameSpaceURI(nsAString& aURI) const = 0;
  NS_IMETHOD GetNameSpacePrefix(nsIAtom** aPrefix) const = 0;

  NS_IMETHOD GetParentNameSpace(nsINameSpace** aParent) const = 0;

  // find name space within self and parents (not children)
  NS_IMETHOD FindNameSpace(nsIAtom* aPrefix, nsINameSpace** aNameSpace) const = 0;
  NS_IMETHOD FindNameSpaceID(nsIAtom* aPrefix, PRInt32* aNameSpaceID) const = 0;
  NS_IMETHOD FindNameSpacePrefix(PRInt32 aNameSpaceID, nsIAtom** aPrefix) const = 0;

  // create new child name space
  NS_IMETHOD CreateChildNameSpace(nsIAtom* aPrefix, 
                                  const nsAString& aURI,
                                  nsINameSpace** aChildNameSpace) = 0;

  NS_IMETHOD CreateChildNameSpace(nsIAtom* aPrefix, PRInt32 aNameSpaceID,
                                  nsINameSpace** aChildNameSpace) = 0;
};

#endif // nsINameSpace_h___
