Slight grammar and spelling nits; updated mx.Proxy URL; added

reference to EST's pyweak.

pep-0205.txt

@@ -15,7 +15,7 @@ Motivation
 
     Caches (weak dictionaries)
 
-        There is a need to allow objects to be maintained to represent
+        There is a need to allow objects to be maintained that represent
         external state, mapping a single instance to the external
         reality, where allowing multiple instances to be mapped to the
         same external resource would create unnecessary difficulty
@@ -38,7 +38,7 @@ Motivation
           back to disk in whole rather than locked & modified for
           every use.
 
-        - Objects which are expensive to create, but may be needed by
+        - Objects that are expensive to create, but may be needed by
           multiple internal consumers.  Similar to the first case, but
           not necessarily bound to external resources, and possibly
           not an issue for shared state.  Weak references are only
@@ -78,7 +78,7 @@ Weak References in Java
     tables.  This can be a performance bottleneck if deallocations of
     the stored objects are infrequent.
 
-    Java's "weak" references are most like Diane Hackborn's old vref
+    Java's "weak" references are most like Dianne Hackborn's old vref
     proposal: a reference object refers to a single Python object,
     but does not own a reference to that object.  When that object is
     deallocated, the reference object is invalidated.  Users of the
@@ -103,19 +103,17 @@ Weak References in Java
 
 Previous Weak Reference Work in Python
 
-    Dianne Hackborn's proposed something called "virtual references".
-    'vref' objects were very similar to java.lang.ref.WeakReference
-    objects, except there was no equivalent to the invalidation
+    Dianne Hackborn has proposed something called "virtual references".
+    'vref' objects are very similar to java.lang.ref.WeakReference
+    objects, except there is no equivalent to the invalidation
     queues.  Implementing a "weak dictionary" would be just as
     difficult as using only weak references (without the invalidation
-    queue) in Java.  Information on this has disappeared from the Web.
-    Original discussion occurred in the comp.lang.python newsgroup; a
-    good archive of that may turn up something more.
+    queue) in Java.  Information on this has disappeared from the Web,
+    but is included below as an Appendix.
 
-    Marc-André Lemburg's mx.Proxy package.  These Web pages appear to
-    be unavailable at the moment.
+    Marc-André Lemburg's mx.Proxy package:
 
-        http://starship.python.net/crew/lemburg/
+        http://www.lemburg.com/files/python/mxProxy.html
 
     The weakdict module by Dieter Maurer is implemented in C and
     Python.  It appears that the Web pages have not been updated since
@@ -128,6 +126,10 @@ Previous Weak Reference Work in Python
 
         http://sourceforge.net/projects/pyweakreference/
 
+    Eric Tiedemann has a weak dictionary implementation:
+
+        http://www.hyperreal.org/~est/python/weak/
+
 
 Possible Applications