diff --git a/molecule/specs/skel.py b/molecule/specs/skel.py
new file mode 100644
index 0000000..81e0a2c
--- /dev/null
+++ b/molecule/specs/skel.py
@@ -0,0 +1,159 @@
+# -*- coding: utf-8 -*-
+#    Molecule Disc Image builder for Sabayon Linux
+#    Copyright (C) 2009 Fabio Erculiani
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+import os
+import molecule.utils
+
+class GenericSpecFunctions:
+
+    def ne_string(self, x):
+        return x, 'raw_unicode_escape'
+
+    def ne_list(self, x):
+        return x
+
+    def always_valid(self, *args):
+        return True
+
+    def valid_path(self, x):
+        return os.path.lexists(x)
+
+    def valid_file(self, x):
+        return os.path.isfile(x)
+
+    def valid_dir(self, x):
+        return os.path.isdir(x)
+
+    def ve_string_stripper(self, x):
+        return unicode(x,'raw_unicode_escape').strip()
+
+    def ve_string_splitter(self, x):
+        return unicode(x,'raw_unicode_escape').strip().split()
+
+    def valid_exec(self, x):
+        molecule.utils.is_exec_available(x)
+        return x
+
+    def valid_exec_first_list_item(self, x):
+        if not x:
+            return False
+        myx = x[0]
+        molecule.utils.is_exec_available(myx)
+        return True
+
+    def valid_ascii(self, x):
+        try:
+            x = str(x)
+            return x
+        except (UnicodeDecodeError, UnicodeEncodeError,):
+            return ''
+
+    def valid_path_string(self, x):
+        try:
+            os.path.split(x)
+        except OSError:
+            return False
+        return True
+
+    def valid_path_list(self, x):
+        return [y.strip() for y in \
+            unicode(x,'raw_unicode_escape').split(",") if \
+                self.valid_path_string(y) and y.strip()]
+
+class GenericExecutionStep:
+
+    """
+    This class implements a single Molecule Runner step (for example: something
+    that copy a chroot from src to dest or generates an ISO image off
+    a directory.
+    """
+
+    def __init__(self, spec_path, metadata):
+        from molecule import Output, Config
+        self.Output = Output
+        self.Config = Config
+        self.spec_path = spec_path
+        self.metadata = metadata
+        self.spec_name = os.path.basename(self.spec_path)
+
+    def pre_run(self):
+        """
+        Pre-run execution hook.
+        """
+        raise NotImplementedError()
+
+    def run(self):
+        """
+        Run execution hook.
+        """
+        raise NotImplementedError()
+
+    def post_run(self):
+        """
+        Post-run execution hook.
+        """
+        raise NotImplementedError()
+
+    def kill(self, success = True):
+        """
+        Kill execution hook.
+        """
+        raise NotImplementedError()
+
+
+class GenericSpec(GenericSpecFunctions):
+
+    EXECUTION_STRATEGY_KEY = "execution_strategy"
+
+    @staticmethod
+    def execution_strategy():
+        """
+        Return a string that describes the supported execution strategy.
+        Such as "remaster", "livecd", etc.
+
+        @return: execution strategy string id
+        @rtype: string
+        """
+        raise NotImplementedError()
+
+    def vital_parameters(self):
+        """
+        Return a list of vital .spec file parameters
+
+        @return: list of vital .spec file parameters
+        @rtype: list
+        """
+        raise NotImplementedError()
+
+    def parser_data_path(self):
+        """
+        Return a dictionary containing parameter names as key and
+        dict containing keys 've' and 'cb' which values are three
+        callable functions that respectively do value extraction (ve),
+        value verification (cb) and value modding (mod).
+
+        @return: data path dictionary (see ChrootSpec code for more info)
+        @rtype: dict
+        """
+        raise NotImplementedError()
+
+    def get_execution_steps(self):
+        """
+        Return a list of GenericExecutionStep classes that will be initialized
+        and executed by molecule.handlers.Runner
+        """
+        raise NotImplementedError()