diff --git a/scripts/laydi-project/project.py b/scripts/laydi-project/project.py
new file mode 100644
index 0000000..5bbaa42
--- /dev/null
+++ b/scripts/laydi-project/project.py
@@ -0,0 +1,281 @@
+import os, os.path
+import sys
+import configobj
+
+from laydi import dataset
+
+NAME = "laydi-cmd"
+VERSION = "0.1.0"
+PROJECT_VERSION_STRING = "Laydi project version 1"
+
+def is_project_directory(dirname):
+    """Verifies that a directory is a laydi project"""
+
+    if not os.path.isdir(dirname):
+        return False
+    
+    ## Verify that the version is correct.
+    version_fn = os.path.join(dirname, "VERSION")
+    if not os.path.exists(version_fn):
+        return False
+    fd = open(version_fn)
+    line = fd.readline()
+    fd.close()
+
+    if fd.strip() != PROJECT_VERSION_STRING:
+        return False
+
+    ## Require directories to be present.
+    if not os.path.isdir(os.path.join(dirname, "annotations")):
+        return False
+    if not os.path.isdir(os.path.join(dirname, "data")):
+        return False
+    if not os.path.isdir(os.path.join(dirname, "selections")):
+        return False
+    if not os.path.isdir(os.path.join(dirname, "exports")):
+        return False
+
+    ## If no tests failed, return True
+    return True
+
+
+def make_project_directory(dirname, force=False):
+    """Creates a project directory
+
+    force: ignore that directory exists and proceed anyway.
+    """
+    if os.path.exists(dirname) and not force:
+        return False
+
+    rootdir = dirname
+    anndir = os.path.join(dirname, "annotations")
+    seldir = os.path.join(dirname, "selections")
+    datadir = os.path.join(dirname, "data")
+    exportdir = os.path.join(dirname, "exports")
+    version_file_path = os.path.join(dirname, "VERSION")
+        
+    os.makedirs(rootdir)
+    for d in [anndir, seldir, datadir, exportdir]:
+        os.mkdir(d)
+
+    fd = open(version_file_path, "w")
+    print >> fd, PROJECT_VERSION_STRING
+    fd.close()
+
+
+
+class Universe(object):
+    """A Universe is a collection of all existing identifiers in a set of datasets"""
+
+    def __init__(self):
+        self.refcount = {}
+
+    def register_dim(self, dim):
+        """Increase reference count for identifiers in Dimension object dim"""
+        d = self.refcount.get(dim.name, None)
+        if d == None:
+            d = {}
+            self.refcount[dim.name] = d
+        for i in dim:
+            d[i] = d.get(i, 0) + 1
+        
+    def register_ds(self, ds):
+        """Increase reference count for identifiers in all Dimensions of dataset ds"""
+        for dim in ds.dims:
+            self.register_dim(dim)
+
+    def unregister_dim(self, dim):
+        """Update reference count for identifiers in Dimension object dim
+           Update reference count for identifiers in Dimension object dim, and remove all
+           identifiers with a reference count of 0, as they do not (by definition) exist 
+           any longer.
+        """
+        ids = self.refcount[dim.name]
+        for i in dim:
+            refcount = ids[i]
+            if refcount == 1:
+                ids.pop(i)
+            else:
+                ids[i] -= 1
+        if len(ids) == 0:
+            self.refcount.pop(dim.name)
+
+
+    def unregister_ds(self, ds):
+        """Update reference count for identifiers along Dimensions in Dataset ds.
+	   Update reference count for identifiers along all Dimensions in
+	   Dataset ds, and remove all identifiers with a reference count of 0,
+           as they do not (by definition) exist any longer.
+        """
+        for dim in ds:
+            self.register_dim(dim)
+
+    def register(self, obj):
+        if isinstance(obj, Dataset):
+            self.register_ds(obj)
+        else:
+            self.register_dim(obj)
+
+    def unregister(self, obj):
+        if isinstance(obj, Dataset):
+            self.unregister_ds(obj)
+        else:
+            self.unregister_dim(obj)
+
+    def __getent___(self, dimname):
+        return set(self.references[dimname].keys())
+
+    def __iter__(self):
+        return self.references.keys().__iter__()
+
+
+class Dimension(object):
+    """A Dimension represents the set of identifiers an object has along an axis.
+    """
+    def __init__(self, name, ids=[]):
+        self.name = name
+        self.idset = set(ids)
+        self.idlist = list(ids)
+
+        if len(self.idset) != len(self.idlist):
+            raise Exception("Duplicate identifiers are not allowed")
+
+    def __getitem__(self, element):
+        return self.idlist[element]
+
+    def __getslice__(self, start, end):
+        return self.idlist[start:end]
+
+    def __contains__(self, element):
+        return self.idset.__contains__(element)
+        
+    def __str__(self):
+        return "%s: %s" % (self.name, str(self.idlist))
+
+    def __len__(self):
+        return len(self.idlist)
+
+    def __iter__(self):
+        return iter(self.idlist)
+
+    def intersection(self, dim):
+        return self.idset.intersection(dim.idset)
+
+    def as_tuple(self):
+        return (self.name, self.idlist)
+
+
+class DirectoryNotifier(object):
+    def __init__(self, path):
+        self.path = path
+        self.files = {}
+        self.subdirs = {}
+        self.timestamp = -1
+        self.file_listeners = {}
+        self.dir_listeners = {}
+        self.update()
+
+    def update(self):
+        now = time.time()
+        for fn in os.listdir(self.path):
+            if os.getctime(fn) > self.timestamp:
+                ext = os.path.splitext(fn)[1]
+                
+
+    def listen_files(self, obj, ext=None):
+        listeners = self.file_listeners
+        if listeners.has_key(ext):
+            listeners[ext].append(obj)
+        else:
+            listeners[ext] = [obj]
+
+
+    def listen_dirs(self, obj, ext=None):
+        listeners = self.dir_listeners
+        if listeners.has_key(ext):
+            listeners[ext].append(obj)
+        else:
+            listeners[ext] = [obj]
+
+
+class DataDirectory(object):
+    def __init__(self, dirname, recursive=False, universe=None):
+        self.dirname = dirname
+
+        ## Read datasets, plots and optionally subdirectories
+        datasets = []
+        ds_fn = {}
+        plots = []
+        plot_fn = {}
+        subdirs = []
+        subdir_fn = {}
+        update_time = 0
+
+        self.update()
+
+    def update(self):
+        ## Remember new timestamp.
+        now = time.time()
+
+        ## Read configuration
+        ini_fn = os.path.join(dirname, "directory.ini")
+        if os.path.isfile(ini_fn) and os.getctime(ini_fn) > self.update_time:
+            self.config = configobj(ini_fn, unrepr=True)
+
+        for fn in os.listdir(self.dirname):
+            ext = os.path.splitext(fn)[1]
+            if ext == "ftsv":
+                ds = dataset.read_ftsv(fn)
+                if universe is not None:
+                    universe.register_ds(ds)
+            elif ext == "plot":
+                plot = configobj(fn, unrepr=True)
+                plots.append(plot)
+            elif os.path.isdir(fn) and recursive:
+                subdirs.append(DataDirectory(fn, recursive=True, universe=universe))
+        
+        ## Set new update time
+        self.update_time = now
+
+
+def SelectionDirectory(object):
+    def __init__(self, dirname):
+        pass
+
+class Project(object):
+    def __init__(self, dirname):
+        """Opens a project directory. The directory must exist and be a valid project."""
+        
+        ## Set path names.
+        self.rootdir = dirname
+        self.anndir = os.path.join(dirname, "annotations")
+        self.seldir = os.path.join(dirname, "selections")
+        self.datadir = os.path.join(dirname, "data")
+        self.exportdir = os.path.join(dirname, "exports")
+        version_file_path = os.path.join(dirname, "VERSION")
+
+        self.universe = Universe()
+        
+        self.data = DataDirectory(self.datadir, universe=self.universe, recursive=True)
+
+    def update(self):
+        for datadir in self.data:
+            datadir.update()
+
+## class Dataset
+## 
+## 
+## class Plot
+## 
+## 
+## class Selection
+## 
+## 
+## class Annotation
+## 
+## 
+## class DataDirectory()
+## 
+## 
+
+