Ok, maybe it was too much

examples/HTML-Labels.rb

@@ -7,7 +7,14 @@
 
 g.add_node( "HTML" )
 
-g.add_node( "struct1", "html" => '<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">  <TR><TD>left</TD><TD PORT="f1">mid dle</TD><TD PORT="f2">right</TD></TR> </TABLE>>]; struct2 [label=< <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">  <TR><TD PORT="f0">one</TD><TD>two</TD></TR> </TABLE>')
+g.add_node( "struct1", "html" => '
+<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+  <TR>
+    <TD>left</TD>
+    <TD PORT="f1">mid dle</TD>
+    <TD PORT="f2">right</TD>
+  </TR>
+</TABLE>' )
 
 g.add_node( "struct2", "html" => '<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">  <TR><TD PORT="f0">one</TD><TD>two</TD></TR> </TABLE>' )
 g.add_node( "struct3", "html" => '<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">  <TR>  <TD ROWSPAN="3">hello<BR/>world</TD>  <TD COLSPAN="3">b</TD>  <TD ROWSPAN="3">g</TD>  <TD ROWSPAN="3">h</TD>  </TR>  <TR>  <TD>c</TD><TD PORT="here">d</TD><TD>e</TD>  </TR>  <TR>  <TD COLSPAN="3">f</TD>  </TR> </TABLE>' )

examples/dot/hello_test.rb

@@ -10,5 +10,5 @@
   g.get_node("World") { |n|
     n.label = "Le Monde"
   }
-}.output(:png => "sample.png")
+}.output(:png => "#{$0}.png")
 

examples/sample29.rb

@@ -5,4 +5,4 @@
 
 GraphViz.new(:G){ |g|
   g.add_node("\"Hello.\"\nHow are you ?", :href => "http://www.website.com", :tooltip => "\"Hello.\"\nHow are you ?", :shape => "ellipse", :color => "#FF0000")
-}.save( :svg => "#{$0}.svg" )
+}.save( :canon => "#{$0}.gv" )

examples/testxml.rb

@@ -4,4 +4,4 @@
 require 'graphviz/xml'
 
 gvxml = GraphViz::XML::new( "test.xml", :text => true, :attrs => true )
-gvxml.output( :png => "#{$0}.png", :use => "dot", :path => ARGV[0] )
+gvxml.output( :png => "#{$0}.png", :use => "dot" )

lib/graphviz.rb

@@ -47,7 +47,7 @@ class GraphViz
   @@prog = "dot"
   @prog
   ## Var: program path
-  @@path = nil
+  @@path = []
   @path
   ## Var: Error level
   @@errors = 1
@@ -298,15 +298,15 @@ def output( *hOpt )
 
       case kElement["type"]
         when "graph_attr"
-          xData << xSeparator + kElement["name"] + " = \"" + kElement["value"] + "\""
+          xData << xSeparator + kElement["name"] + " = " + kElement["value"].to_gv
           xSeparator = "; "
 
         when "node_attr"
-          xData << xSeparator + kElement["name"] + " = \"" + kElement["value"] + "\""
+          xData << xSeparator + kElement["name"] + " = " + kElement["value"].to_gv
           xSeparator = ", "
 
         when "edge_attr"
-          xData << xSeparator + kElement["name"] + " = \"" + kElement["value"] + "\""
+          xData << xSeparator + kElement["name"] + " = " + kElement["value"].to_gv
           xSeparator = ", "
 
         when "node"
@@ -361,7 +361,7 @@ def output( *hOpt )
               end
               @prog = xValue
             when "path"
-              @path = xValue
+              @path = xValue.split( "," )
             when "errors"
               @errors = xValue
             else
@@ -521,7 +521,7 @@ def self.default( hOpts )
         when "use"
           @@prog = v
         when "path"
-          @@path = v
+          @@path = v.split( "," )
         when "errors"
           @@errors = v
         when "output"
@@ -632,7 +632,7 @@ def initialize( xGraphName, *hOpt, &block )
             end
             @oGraphType = xValue.to_s
           when "path"
-            @path = xValue.to_s
+            @path = xValue.split( "," )
           when "errors"
             @errors = xValue
           else
@@ -648,10 +648,10 @@ def initialize( xGraphName, *hOpt, &block )
   # Escape a string to be acceptable as a node name in a graphviz input file
   #
   def self.escape(str, force = false ) #:nodoc:
-    #if force or str.match( /\A[a-zA-Z_]+[a-zA-Z0-9_:]*\Z/ ).nil?
-    #  '"' + str.gsub('"', '\\"').gsub("\n", '\\\\n').gsub(".","\\.") + '"' 
-    if force or str.match( /\A[a-zA-Z_]+[a-zA-Z0-9_:\.]*\Z/ ).nil?
-      '"' + str.gsub('"', '\\"').gsub("\n", '\\\\n') + '"' 
+    if force or str.match( /\A[a-zA-Z_]+[a-zA-Z0-9_:]*\Z/ ).nil?
+      '"' + str.gsub('"', '\\"').gsub("\n", '\\\\n').gsub(".","\\.") + '"' 
+    #if force or str.match( /\A[a-zA-Z_]+[a-zA-Z0-9_:\.]*\Z/ ).nil?
+    #  '"' + str.gsub('"', '\\"').gsub("\n", '\\\\n') + '"' 
     else
       str
     end
@@ -672,8 +672,9 @@ def self.escape(str, force = false ) #:nodoc:
   # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 
   # OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
   # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-  def find_executable(bin = @prog, *paths) #:nodoc:
-    paths = ENV['PATH'].split(File::PATH_SEPARATOR) if paths.empty?
+  def find_executable(bin, paths) #:nodoc:
+    paths = ENV['PATH'].split(File::PATH_SEPARATOR) if paths.nil? or paths.empty?
+
     paths.each do |path|    
       file = (path.nil?)?bin:File.join(path,bin)
       if File.executable?(file) then

lib/graphviz/attrs.rb

@@ -42,23 +42,10 @@ def []=( xKey, xValue )
         raise ArgumentError, "#{@name} attribut '#{xKey.to_s}' invalid"
       end
 
-      value = ArgumentError
-      @attributs[xKey.to_s].each do |type|
-        begin
-          value = GraphViz::Types.const_get(type).new( xValue )
-          break
-        rescue ArgumentError
-          nil
-        end
-      end
-
-      if value == ArgumentError
-        raise ArgumentError, "Value `#{xValue}' not allowed for attribut #{xKey}, type #{@attributs[xKey.to_s].join(" or ")}!"
-      end
-      @data[xKey.to_s] = value
+      @data[xKey.to_s] = GraphViz::Types.const_get(@attributs[xKey.to_s]).new( xValue )
 
       if @graphviz.nil? == false
-        @graphviz.set_position( @name, xKey.to_s, value )
+        @graphviz.set_position( @name, xKey.to_s, @data[xKey.to_s] )
       end
     end
   end