diff --git a/pisi/archive.py b/pisi/archive.py
index 8e52e410..ec86771b 100644
--- a/pisi/archive.py
+++ b/pisi/archive.py
@@ -145,8 +145,10 @@ class ArchiveZip(ArchiveBase):
         os.chdir(cwd)
 
     def unpack_file_cond(self, pred, target_dir, archive_root = ''):
-        """Unpack/Extract a file according to predicate function filename ->
-        bool"""
+        """Unpack/Extract files according to predicate function
+        pred: filename -> bool 
+        unpacks stuff into target_dir and only extracts files
+        from archive_root, treating it as the archive root"""
         zip_obj = self.zip_obj
         for info in zip_obj.infolist():
             if pred(info.filename):   # check if condition holds
diff --git a/pisi/context.py b/pisi/context.py
index 84a80195..7f29cc4c 100644
--- a/pisi/context.py
+++ b/pisi/context.py
@@ -23,6 +23,8 @@ const = pisi.constants.Constants()
 
 config = None
 
+use_mdom = False
+
 def get_option(opt):
     return config and config.get_option(opt)
 
diff --git a/pisi/pxml/xmlext.py b/pisi/pxml/xmlext.py
index 07484ca4..e910eb60 100644
--- a/pisi/pxml/xmlext.py
+++ b/pisi/pxml/xmlext.py
@@ -16,9 +16,12 @@ try:
     from xmlextpiks import *
 except:
     try:
+        gibidi
+        if pisi.context.use_mdom:
+            raise Error('zibidi')
         from xmlextcdom import  *
     except:
-        raise Error('cannot find 4suite implementation')
+        #raise Error('cannot find 4suite implementation')
         print 'xmlext: cDomlette/piksemel implementation cannot be loaded, falling back to minidom'
         from xmlextmdom import *
 
diff --git a/pisi/pxml/xmlfile.py b/pisi/pxml/xmlfile.py
index c8cfe6c6..c09c754e 100644
--- a/pisi/pxml/xmlfile.py
+++ b/pisi/pxml/xmlfile.py
@@ -11,13 +11,20 @@
 #
 # Authors:  Eray Ozkural <eray@uludag.org.tr>
 
+import pisi.context
+
 try:
     horagata # comment out to disable piks
     #from xmlfilepiks import *
 except:
     try:
+        zibidi
+        if pisi.context.use_mdom:
+            raise Error('zibidi')
         from xmlfilecdom import *
     except:
-        raise Error('cannot find 4suite implementation')
+        #raise Error('cannot find 4suite implementation')
         print 'xmlext: cDomlette/piksemel implementation cannot be loaded, falling back to minidom'
         from xmlfilemdom import *
+
+print 'gumburdop'
diff --git a/pisi/pxml/xmlfilemdom.py b/pisi/pxml/xmlfilemdom.py
index bd91e702..1555c087 100644
--- a/pisi/pxml/xmlfilemdom.py
+++ b/pisi/pxml/xmlfilemdom.py
@@ -34,6 +34,7 @@ import codecs
 
 import pisi
 from pisi.pxml.xmlextcdom import *
+from pisi.file import File
 
 class Error(pisi.Error):
     "named this way because the class if mostly used with an import *"
@@ -59,9 +60,12 @@ class XmlFile(object):
         """returns root document element"""
         return self.doc.documentElement
 
-    def readxml(self, fileName):
+    def readxml(self, uri, tmpDir = '/tmp'):
+        uri = File.make_uri(uri)
+        localpath = File.download(uri, tmpDir)
+
         try:
-            self.doc = mdom.parse(fileName)
+            self.doc = mdom.parse(localpath)
         except ExpatError, inst:
             raise Error(_("File '%s' has invalid XML: %s\n") % (fileName,
                                                                 str(inst)))
diff --git a/tools/calc-build-order.py b/tools/calc-build-order.py
new file mode 100755
index 00000000..9adbd11a
--- /dev/null
+++ b/tools/calc-build-order.py
@@ -0,0 +1,79 @@
+#! /usr/bin/python
+# a simple tool to list stuff in source repository
+# author: exa
+
+import sys
+import os
+
+sys.path.insert(0, '.')
+
+import pisi.context as ctx
+ctx.usemdom = True
+print 'hobarey'
+import pisi
+import pisi.api
+import pisi.config
+import pisi.specfile as specfile
+import pisi.util
+from pisi.graph import Digraph
+
+options = pisi.config.Options()
+if len(sys.argv) > 2:
+    options.destdir=sys.argv[2]
+else:
+    options.destdir = '/'
+pisi.api.init(database=False, options=options)
+repo_uri = sys.argv[1]
+
+specfiles = []
+
+for root, dirs, files in os.walk(repo_uri):
+    for fn in files:
+        if fn == 'pspec.xml':
+            #ctx.ui.info(_('Adding %s to package index') % fn)
+            sf = specfile.SpecFile()
+            sf.read(pisi.util.join_path(root, fn))
+            sf.check()
+            print 'read %s: %s' % (sf.source.name, sf.source.version)
+            
+            specfiles.append(sf)
+
+#print specfiles
+
+def plan_build(specfiles):
+    # try to construct a pisi graph of packages to
+    # install / reinstall
+
+    G_f = Digraph()
+    #pgraph.PGraph(packagedb)               # construct G_f
+    
+    pkgtosrc = {}
+
+    for sf in specfiles:
+        for pkg in sf.packages:
+            pkgtosrc[str(pkg.name)] = str(sf.source.name) 
+    
+    # find the "install closure" graph of G_f by package 
+    # set A using packagedb
+    for x in specfiles:
+        #G_f.add_package(x)
+        src = x.source
+        print "adding vtx ", str(src.name)
+        if not str(src.name) in G_f.vertices():
+            G_f.add_vertex(str(src.name), (src.version, src.release))
+        for builddep in src.buildDependencies:
+            G_f.add_edge(str(src.name), str(builddep.package))
+        for pkg in x.packages:
+            for rtdep in pkg.packageDependencies:
+                G_f.add_edge(str(src.name), pkgtosrc[rtdep.package])
+    
+    if ctx.config.get_option('debug'):
+        G_f.write_graphviz(sys.stdout)
+    order = G_f.topological_sort()
+    order.reverse()
+    return G_f, order
+
+G_f, order = plan_build(specfiles)
+
+print order 
+pisi.api.finalize()
diff --git a/tools/check-source-repo.py b/tools/check-source-repo.py
index 11fc6aef..278e444f 100755
--- a/tools/check-source-repo.py
+++ b/tools/check-source-repo.py
@@ -27,6 +27,6 @@ for root, dirs, files in os.walk(repo_uri):
             sf = specfile.SpecFile()
             sf.read(pisi.util.join_path(root, fn))
             sf.check()
-            print '%s: %s' % (sf.source.name, sf.source.version)
+            print 'read %s: %s' % (sf.source.name, sf.source.version)
 
 pisi.api.finalize()