diff --git a/albero/app.py b/albero/app.py
index a36dcc4..0f618b8 100644
--- a/albero/app.py
+++ b/albero/app.py
@@ -47,12 +47,21 @@ class App:
                         "properties": {
                             "app": {
                                 "type": "object",
-                                "default": {},
+                                #"default": {},
                                 "additionalProperties": False,
                                 "properties": {
                                     "root": {
-                                        "type": "string",
                                         "default": None,
+                                        "oneOf": [
+                                            {
+                                            "type": "null",
+                                            "description": "Application current working directory is the `albero.yml` directory",
+                                            },
+                                            {
+                                            "type": "string",
+                                            "description": "Application working directory. If a relative path is used, it will be depending on `albero.yml` directory",
+                                            },
+                                        ]
                                     },
                                 },
                             },
@@ -60,6 +69,21 @@ class App:
                                 # "additionalProperties": False,
                                 "type": "object",
                                 "default": {},
+                                "properties": {
+                                    "prefix": {
+                                        "default": None,
+                                        "oneOf": [
+                                            {
+                                            "type": "null",
+                                            "description": "Disable prefix, all files are lookup up from the app root dir.",
+                                            },
+                                            {
+                                            "type": "string",
+                                            "description": "Add a path prefix before all paths. This is quite useful to store your YAML data in a dedicated tree.",
+                                            },
+                                        ]
+                                    },
+                                  }
                             },
                             "rules": {
                                 "type": "object",
@@ -87,6 +111,7 @@ class App:
 
     def __init__(self, config="albero.yml", namespace="default"):
         conf2 = anyconfig.load(config)
+        self.run = {}
 
         # Validate configuration
         schema_validate(conf2, self.schema)
@@ -96,23 +121,58 @@ class App:
             log.error(f"Can't find namespace '{namespace}' in config '{config}'")
             sys.exit(1)
 
-        # Init
-        if not conf2["config"]["app"]["root"]:
-            conf2["config"]["app"]["root"] = Path(config).parent
+        # Get application paths
+        # =====================
+        # Fetch app root
+        if conf2["config"]["app"]["root"]:
+            path_root = Path(conf2["config"]["app"]["root"])
+            log.debug ("Root path is hard coded.")
         else:
-            conf2["config"]["app"]["root"] = Path(conf2["config"]["app"]["root"])
+            path_root = Path(config).parent
+            log.debug ("Root path guessed from conf file.")
+
+        #path_prefix = conf2["config"]["app"]["prefix"]
+        #if not path_prefix:
+        #    path_prefix = ''
+        #p = Path(path_prefix)
+        #if not p.is_absolute():
+        #    p = path_root / p
+        #    try:
+        #        p = p.resolve().relative_to(Path.cwd().resolve())
+        #    except ValueError:
+        #        pass
+
+        # Save paths
+        path_cwd = str(Path.cwd().resolve())
+        path_root = str(path_root.resolve())
+
+        self.run['path_cwd'] = path_cwd
+        self.run['path_root'] = path_root
+
+        #self.run['path_prefix'] = str(p.resolve())
+        log.debug (f"Working directory is {path_root} while cwd is: {path_cwd}")
+
+
+        #    path_root = path_root.resolve().relative_to(Path.cwd())
+
+        #conf2["config"]["app"]["root"] = str(path_root)
 
         # Finish
         self.conf2 = dict(conf2)
 
+        log.debug("Loading config: %s", config)
+        log.debug("Root directory is: %s", path_root)
+
     def lookup(self, key=None, policy=None, scope=None, trace=False, explain=False):
         log.debug(f"Lookup key {key} with scope: {scope}")
         q = Query(app=self)
         r = q.exec(key=key, scope=scope, policy=policy, trace=trace, explain=explain)
 
-        print("=== Query Result ===")
-        print(anyconfig.dumps(r, ac_parser="yaml"))
-        print("=== Query Result ===")
+        return r
+
+        #print("=== Query Result ===")
+        print(anyconfig.dumps(r, ac_parser=fmt))
+        #print("=== Query Result ===")
 
     def dump_schema(self):
 
@@ -120,11 +180,53 @@ class App:
         import albero.plugin as AlberoPlugins
         from albero.managers import BackendsManager, RulesManager
 
-        r1 = BackendsManager.get_schema(AlberoPlugins)
+        r1 = BackendsManager.get_schema(AlberoPlugins, mode='parts')
         r2 = RulesManager.get_schema(AlberoPlugins)
+        #pprint (r1)
+        print(json.dumps(r1, indent=2))
+        return
 
         d = self.schema
         d["patternProperties"][".*"]["properties"]["tree"]["items"]["properties"] = r1
         d["patternProperties"][".*"]["properties"]["tree"]["items"] = r2
 
         print(json.dumps(d, indent=2))
+
+
+    def gen_docs(self):
+
+        import json
+        import albero.plugin as AlberoPlugins
+        from albero.managers import BackendsManager, RulesManager
+        print ("WIP")
+
+        #src = {
+        #        "app": {
+        #            "config_schema": None,
+        #            "plugin_managers": {
+        #                    'tree': None,
+        #                    'rules': None,
+        #                }
+        #            }
+        #        
+        #r1 = BackendsManager.get_schema(AlberoPlugins, mode='parts')
+
+
+        #print (json.dumps(r1, indent=2))
+
+        #ret = {
+        #    
+        #    }
+
+        #part_config = r1.get('config_schema', None)
+        #part_item = r1['items']['core_schema']
+        #part_item_plugins = r1['items']['plugin']
+
+        #for kind, plugins in part_item_plugins.items():
+
+        #    for plugin_name, schema in plugins.items():
+        #        part_item_
+
+
+
+
diff --git a/albero/cli.py b/albero/cli.py
index 4098b4c..71908df 100644
--- a/albero/cli.py
+++ b/albero/cli.py
@@ -106,12 +106,17 @@ class CmdApp:
         parser.add_argument(
             "-v", "--verbose", action="count", default=0, help="Increase verbosity"
         )
+        parser.add_argument(
+            "-c", "--config", help="Albero configuration file",
+            default="albero.yml",
+        )
         parser.add_argument("help", action="count", default=0, help="Show usage")
         subparsers = parser.add_subparsers(
             title="subcommands", description="valid subcommands", dest="command"
         )
         # Manage command: schema
         add_p = subparsers.add_parser("schema")
+        add_p = subparsers.add_parser("gen_doc")
 
         # Manage command: demo
         add_p = subparsers.add_parser("lookup")
@@ -127,6 +132,7 @@ class CmdApp:
         add_p.add_argument("-p", "--policy")
         add_p.add_argument("-t", "--trace", action="store_true")
         add_p.add_argument("-x", "--explain", action="store_true")
+        add_p.add_argument("-o", "--format", help="Output format", choices=['yaml', 'json', 'xml', 'ini', 'toml'], default='yaml')
         add_p.add_argument("key", default=None, nargs="*")
 
         # Manage command: demo
@@ -178,14 +184,15 @@ class CmdApp:
 
         self.log.info(f"CLI: {keys} with env: {new_params}")
 
-        app = Albero.App(config=config, namespace=self.args.namespace)
+        app = Albero.App(config=self.args.config, namespace=self.args.namespace)
         for key in keys:
-            app.lookup(
+            r = app.lookup(
                 key=key,
                 scope=new_params,
                 trace=self.args.trace,
                 explain=self.args.explain,
             )
+            print(anyconfig.dumps(r, ac_parser=self.args.format))
 
     def cli_schema(self):
         """Display configuration schema"""
@@ -196,5 +203,14 @@ class CmdApp:
         app.dump_schema()
 
 
+    def cli_gen_doc(self):
+        """Generate documentation"""
+
+        config = "/home/jez/prj/bell/training/tiger-ansible/tree.yml"
+        app = Albero.App(config=config)  # , namespace=self.args.namespace)
+        app.gen_docs()
+
+
+
 if __name__ == "__main__":
     app = CmdApp()
diff --git a/albero/managers.py b/albero/managers.py
index 804f2bf..6880aa2 100644
--- a/albero/managers.py
+++ b/albero/managers.py
@@ -41,19 +41,24 @@ class LoadPlugin:
 class Manager:
     """Generic manager class"""
 
+    _app_kind = 'core'
     plugins_kind = []
     _schema_props_default = None
     _schema_props_new = None
     _props_position = None
 
     @classmethod
-    def get_schema(cls, plugins_db):
+    def get_schema(cls, plugins_db, mode='full'):
         """Retrieve configuration schema"""
 
         # Properties
+        ret = {
+                "core_schema": {},
+                "plugin": {},
+                }
         ret3 = {}
         for kind in cls.plugins_kind:
-            # ret[kind] = {}
+            ret['plugin'][kind] = {}
             plugin_kind = getattr(plugins_db, kind)
 
             for plugin_name in [i for i in dir(plugin_kind) if not i.startswith("_")]:
@@ -64,7 +69,7 @@ class Manager:
                         plugin_cls, "_schema_props_new", "MISSING ITEM"
                     )
                     if schema_props:
-                        # ret[kind][plugin_name] = schema_props
+                        ret['plugin'][kind][plugin_name + '_schema' ] = schema_props
                         ret3.update(schema_props)
         ret3.update(cls._schema_props_new)
 
@@ -72,13 +77,23 @@ class Manager:
         ret1 = cls._schema_props_default
         position = cls._props_position
         dpath.util.set(ret1, position, ret3)
+        ret['core_schema'] = cls._schema_props_new
 
-        return ret1
+        if mode == 'full':
+            return ret1
+
+        ret4 = {
+                "config_schema": {},
+                "items": ret,
+                }
+
+        return ret4
 
 
 class BackendsManager(Manager):
     """Backend Manager"""
 
+    _app_kind = 'manager'
     plugins_kind = ["engine", "backend"]
 
     _schema_props_new = {
@@ -212,6 +227,7 @@ class BackendsManager(Manager):
 
 class RulesManager(Manager):
 
+    _app_kind = 'rules'
     plugins_kind = ["strategy"]
 
     _schema_props_new = {
diff --git a/albero/plugin/backend/hier.py b/albero/plugin/backend/hier.py
index 106356c..068503c 100644
--- a/albero/plugin/backend/hier.py
+++ b/albero/plugin/backend/hier.py
@@ -57,40 +57,36 @@ class Plugin(PluginBackendClass):
     def process(self, backends: list, ctx: dict) -> (list, dict):
 
         new_backends = []
+
         for cand in backends:
 
-            # Init
+            # Fetch backend data
             plugin_config = cand.get("hier", {})
             hier_data = plugin_config.get("data", None)
             if not hier_data:
                 new_backends.append(cand)
                 continue
 
-            # Retrieve config data
             hier_var = plugin_config.get("var", "item")
             hier_sep = plugin_config.get("separator", "/")
+
+            # Retrieve data to loop over
             if isinstance(hier_data, str):
+                # If it's a string, fetch value from scope
                 hier_data = cand["_run"]["scope"].get(hier_data, None)
 
-            # Build a new list
+            # Do the hierarchical replacement
+            hier_data = path_assemble_hier(hier_data, hier_sep)
 
-            if isinstance(hier_data, str):
-                r = hier_data.split(hier_sep)
-            assert isinstance(r, list), f"Got: {r}"
-
-            ret1 = []
-            for index, part in enumerate(r):
-
-                try:
-                    prefix = ret1[index - 1]
-                except IndexError:
-                    prefix = f"{hier_sep}"
-                    prefix = ""
-                item = f"{prefix}{part}{hier_sep}"
-                ret1.append(item)
+            if not isinstance(hier_data, list):
+                log.warn("Hier module can't loop over non list data, got: {hier_data}")
+                continue
 
+            # Build result list
+            ret1 = hier_data
+            log.debug (f"Hier plugin will loop over: {ret1}")
             ret2 = []
-            for item in ret1:
+            for index, item in enumerate(ret1):
                 _cand = copy.deepcopy(cand)
                 run = {
                     "index": index,
diff --git a/albero/plugin/backend/loop.py b/albero/plugin/backend/loop.py
index 4fb191d..6726119 100644
--- a/albero/plugin/backend/loop.py
+++ b/albero/plugin/backend/loop.py
@@ -8,6 +8,7 @@ import logging
 import anyconfig
 import textwrap
 
+log = logging.getLogger(__name__)
 
 class Plugin(PluginBackendClass):
 
diff --git a/albero/plugin/engine/jerakia.py b/albero/plugin/engine/jerakia.py
index 3801efa..328e4c2 100644
--- a/albero/plugin/engine/jerakia.py
+++ b/albero/plugin/engine/jerakia.py
@@ -1,5 +1,5 @@
 from pathlib import Path
-from albero.utils import render_template
+from albero.utils import render_template, glob_files
 from albero.plugin.common import PluginEngineClass, PluginFileGlob #, Candidate
 from pprint import pprint
 
@@ -28,7 +28,6 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
     _plugin_name = "jerakia"
 
-    ### OLD
     _plugin_engine = "jerakia"
     # _schema_props_files = {
     _schema_props_new = {
@@ -44,6 +43,20 @@ class Plugin(PluginEngineClass, PluginFileGlob):
                     },
                 },
             ]
+        },
+        "glob": {
+            "default": "ansible.yml",
+            "anyOf": [
+                {
+                    "type": "string",
+                },
+#                {
+#                    "type": "array",
+#                    "items": {
+#                        "type": "string",
+#                    },
+#                },
+            ]
         }
     }
 
@@ -62,7 +75,7 @@ class Plugin(PluginEngineClass, PluginFileGlob):
         self.paths = paths
         self.value = paths
 
-    def _preprocess(self, scope):
+    def _paths_template(self, scope):
 
         # Manage loops
         paths = self.paths
@@ -77,15 +90,15 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
         return ret
 
-    def _show_paths(self, scope):
+    def _show_paths(self, path_top, scope):
 
-        parsed = self._preprocess(scope)
+        parsed = self._paths_template(scope)
         log.debug("Expanded paths to: %s", parsed)
 
         # Look for files (NOT BE HERE !!!)
         ret3 = []
         for p in parsed:
-            globbed = self._glob(p)
+            globbed = glob_files(path_top / p, 'ansible.yaml')
             ret3.extend(globbed)
         log.debug(f"Matched globs: %s", ret3)
 
@@ -93,17 +106,32 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
     def process(self):
 
-        # scope = self.scope
-        # pprint (self.config)
-        scope = dict(self.config["_run"]["scope"])
+        # Detect path root and path prefix
+        path_root = self.app.run['path_root']
+        path_prefix = self.app.conf2['config']['tree']['prefix']
+
+        if path_prefix:
+            path_prefix = Path(path_prefix)
+            if path_prefix.is_absolute():
+                path_top = path_prefix
+            else:
+                path_top = Path(path_root) / path_prefix
+        else:
+            path_top = path_root
+
+        path_top = path_top
+        log.debug (f"Path Top: {path_top}")
+
+
+        scope = self.config["_run"]["scope"]
         key = self.config["_run"]["key"]
         assert isinstance(scope, dict), f"Got: {scope}"
         assert isinstance(key, (str, type(None))), f"Got: {key}"
 
-        t = self._show_paths(scope)
+        # t = self._show_paths(path_top, scope)
 
         ret = []
-        for index, path in enumerate(self._show_paths(scope)):
+        for index, path in enumerate(self._show_paths(path_top, scope)):
             log.debug(f"Reading file: {path}")
             # Fetch data
             found = False
@@ -133,49 +161,3 @@ class Plugin(PluginEngineClass, PluginFileGlob):
 
         return ret
 
-        ######## OLD
-
-        #    # Read raw file content
-        #    data = anyconfig.load(path, ac_parser="yaml")
-        #
-        #    ret_obj2 ={
-        #            "_run": _run,
-
-        #            }
-
-        #    #### OLD
-
-        #    ret_obj = FileCandidate(self.config)
-        #    ret_obj.engine = self
-        #    ret_obj.data = None
-
-        #    found = False
-        #    if key is None:
-        #        ret_obj.data = data
-        #        found = True
-        #    else:
-        #        try:
-        #            ret_obj.data = data[key]
-        #            found = True
-        #        except Exception:
-        #            pass
-
-        #    # ret_obj.run['path'] = path
-        #    # ret_obj.run['found'] = found
-        #    # ret_obj.run['scope'] = scope
-        #    # ret_obj.run['key'] = key
-        #    be = {
-        #            "index": index,
-        #            "path": path,
-        #            "rel_path": str(Path(path).relative_to(Path.cwd())),
-        #            }
-        #    #qu = {
-        #    #        "scope": scope,
-        #    #        "key": key,
-        #    #        }
-        #    ret_obj.run['backend'] = be
-        #    #ret_obj.run['query'] = qu
-
-        #    #log.debug(f"Found value: {ret_obj}")
-        #    ret_obj.found = found
-        #    ret.append(ret_obj)
diff --git a/albero/plugin/strategy/schema.py b/albero/plugin/strategy/schema.py
index e1d2fdc..d5d7d68 100644
--- a/albero/plugin/strategy/schema.py
+++ b/albero/plugin/strategy/schema.py
@@ -91,6 +91,7 @@ class Plugin(PluginStrategyClass):
 
         trace = rule["trace"]
         explain = rule["explain"]
+
         schema = rule.get("schema", None) or self.default_merge_schema
         merger = Merger(schema)
         t = PrettyTable()
diff --git a/albero/utils.py b/albero/utils.py
index ff857cb..d30e3be 100644
--- a/albero/utils.py
+++ b/albero/utils.py
@@ -12,56 +12,42 @@ import logging
 
 log = logging.getLogger(__name__)
 
-
-#   # File parsers
-#   # =====================
-#
-#   class FileParserClass():
-#
-#       def __init__(self, path):
-#           self.path = path
-#
-#       def from_file(self, file):
-#           raise Exception ("Not implemented")
-#
-#       def from_string(self, data):
-#           raise Exception ("Not implemented")
-#
-#       def from_dict(self, data):
-#           raise Exception ("Not implemented")
-#
-#   class FilesYAMLParser(FileParserClass):
-#       def get_data(self):
-#           with open(self.path, "r") as stream:
-#               try:
-#                   return yaml.safe_load(stream)
-#               except yaml.YAMLError as exc:
-#                   raise Exception(exc)
-#                   print(exc)
-#
-#
-#   class FilesJSONParser(FileParserClass):
-#       pass
-#   class FilesRawParser(FileParserClass):
-#       pass
-#   class FilesTOMLParser(FileParserClass):
-#       pass
-#   class FilesCSVParser(FileParserClass):
-#       pass
-#   class FilesINIParser(FileParserClass):
-#       pass
-#
-#   format_db = {
-#       ".raw": FilesRawParser,
-#       ".yml": FilesYAMLParser,
-#       ".yaml": FilesYAMLParser,
-#       ".json": FilesJSONParser,
-#           }
-
-
 # Utils Methods
 # =====================
 
+def glob_files(path, pattern):
+    log.debug(f"Search glob '{pattern}' in '{path}'")
+    p = Path(path)
+    ret = p.glob(pattern)
+    return [str(i) for i in ret]
+
+
+def path_assemble_hier(path, sep='/'):
+    """Append the previous 
+
+    """
+
+    if isinstance(path, str):
+        list_data = path.split(sep)
+    elif isinstance(path, list):
+        list_data = []
+    else:
+        raise Exception (f"This function only accepts string or lists, got: {path}")
+
+
+    assert isinstance(list_data, list), f'Got: {list_data}'
+    ret = []    
+    for index, part in enumerate(list_data):    
+        try:    
+            prefix = ret[index - 1]    
+        except IndexError:    
+            prefix = f"{sep}"    
+            prefix = ""    
+        item = f"{prefix}{part}{sep}"    
+        ret.append(item)    
+    return ret
+
+
 
 def render_template(path, params):
     """Render template for a given string"""
@@ -69,35 +55,6 @@ def render_template(path, params):
     t = Template(path)
     return t.render(**params)
 
-
-# def read_file(file):
-#    with open(file, 'r') as f:
-#        data = f.read().replace('\n', '')
-#    return data
-#
-#
-# def parse_file(file, fmt='auto'):
-#    print ("DEPRECATED")
-#    raise Exception ("parse_file is deprecated")
-#
-#    data = read_file(file)
-#
-#    # Autodetect format from file name
-#    if fmt == 'auto':
-#        p = Path(file)
-#        fmt = p.suffix
-#    else:
-#        fmt = f".{fmt}"
-#
-#    # Retrieve parser
-#    if fmt is None:
-#        raise Exception ("No available driver to read file: %s" % p )
-#    fmt_cls = format_db.get(fmt, None)
-#
-#    # Parse content
-#    o = fmt_cls(str(p))
-#    return o.get_data()
-
 # Schema Methods
 # =====================