diff --git a/src/pisi-build b/src/pisi-build
index a9942559..50d276ff 100755
--- a/src/pisi-build
+++ b/src/pisi-build
@@ -6,20 +6,26 @@ from os.path import basename
 
 import pisi.config
 import pisi.util
+import pisi.ui
 from pisi.build import PisiBuild, PisiBuildError
 
+def usage(progname = "pisi-build"):
+    print """
+Usage:
+%s [options] package-name.pspec
+""" %(progname)
 
 def doProgress(filename, percent, rate, symbol):
     out = '\r%-30.30s %3d%% %12.2f %s' % \
         (pd['filename'], pd['percent'], pd['rate'], pd['symbol'])
-    pisi.util.information(out)
+    pisi.ui.info(out)
 
 def main():
     import sys
     import getopt
     
     # wrapper for usage(progname) function
-    help = lambda: pisi.util.usage(sys.argv[0])
+    help = lambda: usage(sys.argv[0])
 
     # getopt magic
     try:
@@ -47,11 +53,11 @@ def main():
 
     # doing the real job.
     pb = PisiBuild(pspec)
-    pisi.util.information("Building PISI source package: %s\n" % pb.spec.sourceName)
+    pisi.ui.info("Building PISI source package: %s\n" % pb.spec.sourceName)
 
-    pisi.util.information("Fetching source from: %s (be patient)\n" % pb.spec.archiveUri)
+    pisi.ui.info("Fetching source from: %s (be patient)\n" % pb.spec.archiveUri)
     pb.fetchArchive(doProgress)
-    pisi.util.information("Source archive is stored: %s/%s\n" %(pisi.config.archives_dir, pb.archiveName))
+    pisi.ui.info("Source archive is stored: %s/%s\n" %(pisi.config.archives_dir, pb.archiveName))
     # pb.unpackArchive()
     # pb.applyPatches()
     # pb.buildSource()
diff --git a/src/pisi-install b/src/pisi-install
index a18d8d75..9871d9e6 100755
--- a/src/pisi-install
+++ b/src/pisi-install
@@ -4,12 +4,18 @@
 import pisi.install
 import pisi.util
 
+def usage(progname = "pisi-install"):
+    print """
+Usage:
+%s [options] <packagefilename>
+""" %(progname)
+
 def main():
     import sys
     import getopt
     
     # wrapper for usage(progname) function
-    help = lambda: pisi.util.usage(sys.argv[0])
+    help = lambda: usage(sys.argv[0])
 
     # getopt magic
     try:
diff --git a/src/pisi/archive.py b/src/pisi/archive.py
new file mode 100644
index 00000000..4120d255
--- /dev/null
+++ b/src/pisi/archive.py
@@ -0,0 +1,3 @@
+# utilities to extract and build archives of zip, tar, targz, tarbz2
+# maintainer: baris and murat
+
diff --git a/src/pisi/build.py b/src/pisi/build.py
index b0a122c4..b4adc0f6 100644
--- a/src/pisi/build.py
+++ b/src/pisi/build.py
@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+# package bulding stuff
+# maintainer: baris and meren
 
 # python standard library
 import os
@@ -10,7 +12,7 @@ from fetcher import Fetcher
 # import pisipackage
 import util
 import config
-
+import ui
 
 class PisiBuildError(Exception):
     pass
@@ -36,7 +38,7 @@ class PisiBuild:
         destpath = fetch.filedest + "/" + fetch.filename
         if os.access(destpath, os.R_OK):
             if util.md5_file(destpath)==self.spec.archiveMD5:
-                util.information(fetch.filename + " cached\n")
+                ui.info(fetch.filename + " cached\n")
                 return
 
         if percentHook:
@@ -57,5 +59,5 @@ class PisiBuild:
 
     def buildPackages(self):
         for package in self.spec.packages:
-            util.information("** Building package %s\n" % package.name);
+            ui.info("** Building package %s\n" % package.name);
     
diff --git a/src/pisi/dependency.py b/src/pisi/dependency.py
index 61e0b859..9f1379f8 100644
--- a/src/pisi/dependency.py
+++ b/src/pisi/dependency.py
@@ -1 +1,3 @@
 # dependency analyzer
+# maintainer: eray and caglar
+
diff --git a/src/pisi/fetcher.py b/src/pisi/fetcher.py
index cae68542..97e70b41 100644
--- a/src/pisi/fetcher.py
+++ b/src/pisi/fetcher.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # download magic
+# maintainer: baris and meren
 
 # python standard library modules
 import urlparse
diff --git a/src/pisi/install.py b/src/pisi/install.py
index 1003413e..c4f4f04e 100644
--- a/src/pisi/install.py
+++ b/src/pisi/install.py
@@ -4,9 +4,10 @@
 from specfile import SpecFile
 from package import Package
 import util
-#import repodb
-#import packagedb
-#import dependency
+import ui
+import installdb
+import packagedb
+import dependency
 #import conflicts
 
 
@@ -15,15 +16,16 @@ def install_package_file(package_fn):
     package = Package(package_fn, "r")
     # extract control files
     util.clean_directory(install_dir)
+    ui.info.("extracting files\n")
     package.extract_files(install_dir)
 
     # verify package
     # check if we have all required files
 
-    specfile = SpecFile()
-    specfile.read(install_dir + "/pspec.xml")
+    spec = PackageSpecFile()
+    spec.read(install_dir + '/pspec.xml')
     # check pspec semantics
-    specfile.verify()
+    spec.verify()
     # check file system requirements
     # check conflicts
     # check dependencies
@@ -31,6 +33,7 @@ def install_package_file(package_fn):
     # unzip package in place
 
     # update databases
+    installdb.install(spec.install_dir + '/files.xml')
 
     # installdb
     
diff --git a/src/pisi/installdb.py b/src/pisi/installdb.py
index bbc09cb1..76a098af 100644
--- a/src/pisi/installdb.py
+++ b/src/pisi/installdb.py
@@ -1,25 +1,43 @@
 # -*- coding: utf-8 -*-
 # installation database
+# maintainer: eray and caglar
 
+from config import *
 import shelve
+import util
+
 
 d = shelve.open( db_dir + '/install.dbm')
 
+files_dir = archive_dir + "/files"
+
 class InstallDBError(Exception):
     pass
 
+def files_name(name, version, release):
+    return files + '/' + name + '-' + version + '-' + release
 
+def is_recorded(name, version, release):
+    key = (name, version, release)
+    return d.has_key( key )
 
-def isRecorded(name, version, release):
-    return d.has_key( (name, version, release) )
+def is_installed(name, version, release):
+    key = (name, version, release)
+    return is_recorded(key) and d[key]=='i'
 
-def isInstalled(name, version, release):
-    return d.has_key( (name, version, release) )
-
-def install( name, version, release, state):
-    if isInstalled(name,version,release):
+def install( name, version, release, files_xml):
+    key = (name, version, release)
+    if isInstalled(key):
         raise InstallDBError("already installed")
-    d[ (name,version,release) ] = state
-    
+    d[key] = 'i'
+    util.copy_file(files_xml, files_name( name, version, release) )
+                   
 def remove( name, version, release):
-    if 
+    key = (name, version, release)
+    d[key] = 'r'
+
+def purge( name, version, release):
+    d.delete(key)
+    util.remove_file( files_name( name, version, release) )
+
+
diff --git a/src/pisi/package.py b/src/pisi/package.py
index f38e90c0..c7255d76 100644
--- a/src/pisi/package.py
+++ b/src/pisi/package.py
@@ -1,5 +1,6 @@
 # package abstraction
 # provides methods to add/remove files, extract control files
+# maintainer: baris and meren
 
 class Package:
     """Package: PISI package class"""
diff --git a/src/pisi/packagedb.py b/src/pisi/packagedb.py
index 4e7790f1..bb4f5d56 100644
--- a/src/pisi/packagedb.py
+++ b/src/pisi/packagedb.py
@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 # package database
 # interface for update/query to local package repository
+# maintainer: eray and caglar
 
 import shelve
 
-files_dir = archive_dir + "/files"
 
diff --git a/src/pisi/util.py b/src/pisi/util.py
index 5fd31aaa..91d06f39 100644
--- a/src/pisi/util.py
+++ b/src/pisi/util.py
@@ -1,14 +1,11 @@
 # -*- coding: utf-8 -*-
 # misc. utility functions, including process and file utils
+# maintainer: eray and caglar and baris and meren!
 
 import os
 import sys
 import md5
 
-def information(message):
-    sys.stdout.write(message)
-    sys.stdout.flush()
-
 # check if directory exists, and create if it doesn't
 # works recursively
 # FIXME: could hav a better name
@@ -49,9 +46,3 @@ def strlist(l):
 
 class ArgError(Exception):
     pass
-
-def usage(progname = "pisi-build"):
-    print """
-Usage:
-%s [options] package-name.pspec
-""" %(progname)