diff --git a/lodstorage/__init__.py b/lodstorage/__init__.py
index 906d362..49e0fc1 100644
--- a/lodstorage/__init__.py
+++ b/lodstorage/__init__.py
@@ -1 +1 @@
-__version__ = "0.6.0"
+__version__ = "0.7.0"
diff --git a/lodstorage/sample2.py b/lodstorage/sample2.py
new file mode 100644
index 0000000..43ff435
--- /dev/null
+++ b/lodstorage/sample2.py
@@ -0,0 +1,131 @@
+"""
+Created on 2024-01-21
+
+@author: wf
+"""
+from dataclasses import dataclass, field
+from datetime import date, datetime
+from typing import List, Optional
+
+from dataclasses_json import dataclass_json
+
+class DateConvert:
+    """
+    date converter
+    """
+    @classmethod
+    def iso_date_to_datetime(cls,iso_date:str)->datetime.date:
+        date=datetime.strptime(iso_date, "%Y-%m-%d").date() if iso_date else None
+        return date
+
+
+@dataclass_json
+@dataclass
+class Royal:
+    """
+    A member of the royal family
+    """
+
+    name: str
+    wikidata_id: str
+    number_in_line: Optional[int] = None
+    born_iso_date: Optional[str] = None
+    died_iso_date: Optional[str] = None
+    last_modified_iso: str = field(init=False)
+    age: Optional[int] = field(init=None)
+    of_age: Optional[bool] = field(init=None)
+    wikidata_url: Optional[str] = field(init=None)
+
+    def __post_init__(self):
+        """
+        init calculated fields
+        """
+        self.lastmodified = datetime.utcnow()
+        self.last_modified_iso = self.lastmodified.strftime("%Y-%m-%dT%H:%M:%SZ")
+        end_date = self.died if self.died else date.today()
+        self.age = int((end_date - self.born).days / 365.2425)
+        self.of_age = self.age >= 18
+        if self.wikidata_id:
+            self.wikidata_url=f"https://www.wikidata.org/wiki/{self.wikidata_id}" 
+    @property
+    def born(self) -> date:
+        """Return the date of birth from the ISO date string."""
+        born_date = DateConvert.iso_date_to_datetime(self.born_iso_date)
+        return born_date
+   
+
+    @property
+    def died(self) -> Optional[date]:
+        """Return the date of death from the ISO date string, if available."""
+        died_date = DateConvert.iso_date_to_datetime(self.died_iso_date)
+        return died_date
+
+@dataclass_json
+@dataclass
+class Royals:
+    """
+    A collection of Royal family members
+    """
+
+    members: List[Royal] = field(default_factory=list)
+
+
+class Sample:
+    """
+    Sample dataset provider
+    """
+
+    @staticmethod
+    def get(dataset_name: str):
+        """
+        Get the given sample dataset name
+        """
+        if dataset_name == "royals":
+            return Royals(
+                members=[
+                    Royal(
+                        name="Elizabeth Alexandra Mary Windsor",
+                        born_iso_date="1926-04-21",
+                        died_iso_date="2022-09-08",
+                        wikidata_id="Q9682",
+                    ),
+                    Royal(
+                        name="Charles III of the United Kingdom",
+                        born_iso_date="1948-11-14",
+                        number_in_line=0,
+                        wikidata_id="Q43274",
+                    ),
+                    Royal(
+                        name="William, Duke of Cambridge",
+                        born_iso_date="1982-06-21",
+                        number_in_line=1,
+                        wikidata_id="Q36812",
+                    ),
+                    Royal(
+                        name="Prince George of Wales",
+                        born_iso_date="2013-07-22",
+                        number_in_line=2,
+                        wikidata_id="Q13590412",
+                    ),
+                    Royal(
+                        name="Princess Charlotte of Wales",
+                        born_iso_date="2015-05-02",
+                        number_in_line=3,
+                        wikidata_id="Q18002970",
+                    ),
+                    Royal(
+                        name="Prince Louis of Wales",
+                        born_iso_date="2018-04-23",
+                        number_in_line=4,
+                        wikidata_id="Q38668629",
+                    ),
+                    Royal(
+                        name="Harry Duke of Sussex",
+                        born_iso_date="1984-09-15",
+                        number_in_line=5,
+                        wikidata_id="Q152316",
+                    ),
+                ]
+            )
+        else:
+            raise ValueError("Unknown dataset name")
diff --git a/lodstorage/version.py b/lodstorage/version.py
index 7ef3df9..010ee07 100644
--- a/lodstorage/version.py
+++ b/lodstorage/version.py
@@ -14,5 +14,5 @@ class Version(object):
     name = "pylodstorage"
     version = lodstorage.__version__
     date = "2020-09-10"
-    updated = "2024-01-07"
+    updated = "2024-01-21"
     description = "python List of Dict (Table) Storage library"
diff --git a/pyproject.toml b/pyproject.toml
index 9afb3fc..954a340 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,9 @@ dependencies = [
     "jsonpickle==1.5.2",
     "pylatexenc~=2.10",
     "pygments",
-    "dicttoxml2"
+    "dicttoxml2",
+    # https://pypi.org/project/dataclasses-json/
+    "dataclasses-json>=0.6.1",
 ]
 requires-python = ">=3.9"
 classifiers=[
diff --git a/tests/test_rdf.py b/tests/test_rdf.py
index 3904a6a..bc6ce00 100644
--- a/tests/test_rdf.py
+++ b/tests/test_rdf.py
@@ -3,25 +3,25 @@
 
 @author: wf
 """
+from lodstorage.sample2 import Sample
 from tests.basetest import Basetest
-from lodstorage.sample import Sample
-import json
+
 
 class TestTriplify(Basetest):
-    
+
     """
     Tests https://github.com/WolfgangFahl/pyLoDStorage/issues/57
     """
+
     def setUp(self, debug=False, profile=True):
         Basetest.setUp(self, debug=debug, profile=profile)
-    
+
     def test_rdf_triples(self):
         """
         test creating RDF triples
         """
-        lod = Sample.getRoyals()
-        debug=self.debug
-        debug=True
+        royals = Sample.get("royals")
+        debug = self.debug
+        debug = True
         if debug:
-            print(json.dumps(lod,indent=2,default=str))
-        
\ No newline at end of file
+            print(royals.to_json(indent=2))