Merged from REXML main repository:

Fixes ticket:68.
  NOTE that this involves an API change!  Entity declarations in the doctype
  now generate events that carry two, not one, arguments.

Implements ticket:15, using gwrite's suggestion.  This allows Element to be
subclassed.

Two unrelated changes, because subversion is retarded and doesn't do
block-level commits:

  1) Fixed a typo bug in previous change for ticket:15
  2) Fixed namespaces handling in XPath and element.  

    ***** Note that this is an API change!!! *****

    Element.namespaces() now returns a hash of namespace mappings which are
    relevant for that node.

Fixes a bug in multiple decodings

The changeset 1230:1231 was bad.  The default behavior is *not* to use the
native REXML encodings by default, but rather to use ICONV by default.  I know
that this will piss some people off, but defaulting to the pure Ruby version
isn't the correct solution, and it breaks other encodings, so I've reverted it.

* Fixes ticket:61 (xpath_parser)
* Fixes ticket:63 (UTF-16; UNILE decoding was bad)
* Cleans up some tests, removing opportunities for test corruption
* Improves parsing error messages a little
* Adds the ability to override the encoding detection in Source construction
* Fixes an edge case in Functions::string, where document nodes weren't 
  correctly converted
* Fixes Functions::string() for Element and Document nodes
* Fixes some problems in entity handling

Addresses ticket:66

Fixes ticket:71

Addresses ticket:78
  NOTE: that this also fixes what is technically another bug in REXML.  REXML's
  XPath parser used to allow exponential notation in numbers.  The XPath spec
  is specific about what a number is, and scientific notation is not included.
  Therefore, this has been fixed.

Cross-ported a fix for ticket:88 from CVS.

Fixes ticket:80

Documentation cleanup.  Ticket:84

Applied Kou's fix for an un-trac'ed bug.

------------------------------------------------------------------------


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rexml/element.rb

@@ -94,7 +94,7 @@ module REXML
 		#   new_a = d.root.clone
 		#   puts new_a  # => "<a/>"
 		def clone
-			Element.new self
+			self.class.new self
 		end
 
 		# Evaluates to the root node of the document that this element 
@@ -200,9 +200,9 @@ module REXML
 		end
 
 		def namespaces
-			namespaces = []
+			namespaces = {}
 			namespaces = parent.namespaces if parent
-			namespaces |= attributes.namespaces
+			namespaces = namespaces.merge( attributes.namespaces )
 			return namespaces
 		end
 
@@ -494,13 +494,12 @@ module REXML
 		#  doc.root.add_element 'c'    #-> '<a><b/>Elliott<c/></a>'
 		#  doc.root.text = 'Russell'   #-> '<a><b/>Russell<c/></a>'
 		#  doc.root.text = nil         #-> '<a><b/><c/></a>'
-		def text=( text )
+    def text=( text )
       if text.kind_of? String
         text = Text.new( text, whitespace(), nil, raw() )
       elsif text and !text.kind_of? Text
         text = Text.new( text.to_s, whitespace(), nil, raw() )
       end
-        
 			old_text = get_text
 			if text.nil?
 				old_text.remove unless old_text.nil?
@@ -557,13 +556,9 @@ module REXML
 		#################################################
 
 		def attribute( name, namespace=nil )
-			prefix = ''
-			if namespace
-				prefix = attributes.prefixes.each { |prefix|
-					return "#{prefix}:" if namespace( prefix ) == namespace
-				} || ''
-			end
-			attributes.get_attribute( "#{prefix}#{name}" )
+			prefix = nil
+      prefix = namespaces.index(namespace) if namespace
+			attributes.get_attribute( "#{prefix ? prefix + ':' : ''}#{name}" )
 		end
 
 		# Evaluates to +true+ if this element has any attributes set, false
@@ -1172,16 +1167,16 @@ module REXML
 		end
 
 		def namespaces
-			namespaces = []
+			namespaces = {}
 			each_attribute do |attribute|
-				namespaces << attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
+				namespaces[attribute.name] = attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
 			end
 			if @element.document and @element.document.doctype
 				expn = @element.expanded_name
 				expn = @element.document.doctype.name if expn.size == 0
 				@element.document.doctype.attributes_of(expn).each {
 					|attribute|
-					namespaces << attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
+					namespaces[attribute.name] = attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
 				}
 			end
 			namespaces