diff --git a/resources/base.imsc.json.example b/resources/base.imsc.json.example
index 6afc927..2033913 100644
--- a/resources/base.imsc.json.example
+++ b/resources/base.imsc.json.example
@@ -1,4 +1,5 @@
 {
+  "order": 1,
   "id": "c5bed39a-4379-11ef-ba5a-ffbc783163b6",
   "name" : "Generic metadata schema",
   "instrument" : "",
diff --git a/resources/coda.imsc.json.example b/resources/coda.imsc.json.example
index f0efeb6..da2d12f 100644
--- a/resources/coda.imsc.json.example
+++ b/resources/coda.imsc.json.example
@@ -1,4 +1,5 @@
 {
+  "order": 1,
   "id" : "715ce7ba-3f91-11ef-932f-37a5c6fd60b1",
   "name" : "Coda Metadata Schema",
   "instrument": "coda",
diff --git a/resources/config.sample.json b/resources/config.sample.json
index b6718ac..be1953a 100644
--- a/resources/config.sample.json
+++ b/resources/config.sample.json
@@ -27,7 +27,8 @@
       "hash_file_extension": "b2b",
       "ingestor_files_directory": "../ingestor",
       "message_to_file": true,
-      "message_file_extension": "message.json"
+      "message_file_extension": "message.json",
+      "use_full_file_path": false
     }
   },
   "kafka": {
diff --git a/resources/dream.imsc.json.example b/resources/dream.imsc.json.example
index 37ed6d4..6a0c36d 100644
--- a/resources/dream.imsc.json.example
+++ b/resources/dream.imsc.json.example
@@ -1,4 +1,5 @@
 {
+  "order": 1,
   "id" : "72a991ee-437a-11ef-8fd2-1f95660accb7",
   "name" : "dream Metadata Schema",
   "instrument": "dream",
diff --git a/resources/loki.imsc.json.example b/resources/loki.imsc.json.example
index cc9e813..625e86b 100644
--- a/resources/loki.imsc.json.example
+++ b/resources/loki.imsc.json.example
@@ -1,4 +1,5 @@
 {
+  "order": 1,
   "id" : "891322f6-437a-11ef-980a-7bdc756bd0b3",
   "name" : "Loki Metadata Schema",
   "instrument": "loki",
diff --git a/src/scicat_communication.py b/src/scicat_communication.py
index 1257564..f7f9f7a 100644
--- a/src/scicat_communication.py
+++ b/src/scicat_communication.py
@@ -2,6 +2,7 @@
 # Copyright (c) 2024 ScicatProject contributors (https://github.com/ScicatProject)
 import json
 import logging
+from dataclasses import asdict
 from typing import Any
 from urllib.parse import quote, urljoin
 
@@ -107,15 +108,13 @@ def create_scicat_origdatablock(
     return result
 
 
-def render_full_url(
-    url: str,
-    config: SciCatOptions,
-) -> str:
+def render_full_url(url: str, config: SciCatOptions) -> str:
+    urls = asdict(config.urls)
     if not url.startswith("http://") and not url.startswith("https://"):
-        for endpoint in config.urls.keys():
+        for endpoint in urls.keys():
             if url.startswith(endpoint):
-                url = url.replace(endpoint, config.urls[endpoint])
-                break
+                return url.replace(endpoint, urls[endpoint])
+
     return url
 
 
diff --git a/src/scicat_configuration.py b/src/scicat_configuration.py
index 12de863..129a10a 100644
--- a/src/scicat_configuration.py
+++ b/src/scicat_configuration.py
@@ -204,6 +204,7 @@ class FileHandlingOptions:
     ingestor_files_directory: str = "../ingestor"
     message_to_file: bool = True
     message_file_extension: str = "message.json"
+    use_full_file_path: bool = False
 
 
 @dataclass(kw_only=True)
diff --git a/src/scicat_dataset.py b/src/scicat_dataset.py
index df81824..b10fad7 100644
--- a/src/scicat_dataset.py
+++ b/src/scicat_dataset.py
@@ -60,6 +60,15 @@ def to_date(value: Any) -> str | None:
 
 
 def to_dict(value: Any) -> dict:
+    if isinstance(value, str):
+        result = ast.literal_eval(value)
+        if isinstance(result, dict):
+            return result
+        else:
+            raise ValueError(
+                "Invalid value. Must be able to convert to a dictionary. Got ", value
+            )
+
     return dict(value)
 
 
@@ -93,9 +102,20 @@ def convert_to_type(input_value: Any, dtype_desc: str) -> Any:
         "join_with_space": lambda value: ", ".join(
             ast.literal_eval(value) if isinstance(value, str) else value
         ),
-        "evaluate": lambda value: ast.literal_eval(value),
+        # "evaluate": lambda value: ast.literal_eval(value),
+        # We are not adding the evaluate function here since
+        # ``evaluate`` function should be avoided if possible.
+        # It might seem easy to use, but it is very easy to break
+        # when the input is not as expected.
+        # It is better to use the specific converters for the types.
+        # However, if it is the only way to go, you can add it here.
+        # Please add a comment to explain why it is needed.
         "filename": lambda value: os.path.basename(value),
+        "dirname": lambda value: os.path.dirname(value),
         "dirname-2": lambda value: os.path.dirname(os.path.dirname(value)),
+        "getitem": lambda value, key: value[
+            key
+        ],  # The only operator that takes an argument
     }
 )
 
@@ -129,6 +149,7 @@ def extract_variables_values(
     config: OfflineIngestorConfig,
 ) -> dict:
     variable_map = {
+        "ingestor_run_id": str(uuid.uuid4()),
         "filepath": pathlib.Path(config.nexus_file),
         "now": datetime.datetime.now(tz=datetime.UTC).isoformat(),
     }
@@ -137,12 +158,13 @@ def extract_variables_values(
         if isinstance(variable_recipe, NexusFileMetadataVariable):
             value = _retrieve_values_from_file(variable_recipe, h5file)
         elif isinstance(variable_recipe, ScicatMetadataVariable):
+            full_endpoint_url = render_full_url(
+                render_variable_value(variable_recipe.url, variable_map),
+                config.scicat,
+            )
             value = retrieve_value_from_scicat(
                 config=config.scicat,
-                scicat_endpoint_url=render_full_url(
-                    render_variable_value(variable_recipe.url, variable_map),
-                    config.scicat,
-                ),
+                scicat_endpoint_url=full_endpoint_url,
                 field_name=variable_recipe.field,
             )
         elif isinstance(variable_recipe, ValueMetadataVariable):
@@ -152,7 +174,12 @@ def extract_variables_values(
                 if isinstance(value, str)
                 else value
             )
-            value = _get_operator(variable_recipe.operator)(value)
+            _operator = _get_operator(variable_recipe.operator)
+            if variable_recipe.field:
+                value = _operator(value, variable_recipe.field)
+            else:
+                value = _operator(value)
+
         else:
             raise Exception("Invalid variable source: ", source)
         variable_map[variable_name] = convert_to_type(value, variable_recipe.value_type)
@@ -165,7 +192,7 @@ def extract_paths_from_h5_file(
     _path: list[str],
 ) -> list[str]:
     master_key = _path.pop(0)
-    output_paths = [master_key]
+    output_paths = []
     if "*" in master_key:
         temp_keys = [k2 for k2 in _h5_object.keys() if re.search(master_key, k2)]
         for key in temp_keys:
@@ -216,6 +243,8 @@ class ScicatDataset:
     proposalId: str | None = None
     ownerGroup: str | None = None
     accessGroups: list[str] | None = None
+    startTime: str | None = None
+    endTime: str | None = None
 
 
 @dataclass(kw_only=True)
diff --git a/src/scicat_metadata.py b/src/scicat_metadata.py
index 9006249..eacaab0 100644
--- a/src/scicat_metadata.py
+++ b/src/scicat_metadata.py
@@ -67,6 +67,8 @@ class ValueMetadataVariable(MetadataSchemaVariable):
 
     operator: str = ""
     value: str
+    field: str | None = None
+    # We only allow one field(argument) for now
 
 
 @dataclass(kw_only=True)
@@ -110,6 +112,7 @@ class MetadataSchema:
     name: str
     instrument: str
     selector: str | dict
+    order: int
     variables: dict[str, MetadataSchemaVariable]
     schema: dict[str, MetadataItem]
 
@@ -138,6 +141,12 @@ def from_file(cls, schema_file_name: pathlib.Path) -> "MetadataSchema":
 
 
 def render_variable_value(var_value: str, variable_registry: dict) -> str:
+    # If it is only one variable, then it is a simple replacement
+    if (var_key := var_value.removesuffix(">").removeprefix("<")) in variable_registry:
+        return variable_registry[var_key]
+
+    # If it is a complex variable, then it is a combination of variables
+    # similar to f-string in python
     for reg_var_name, reg_var_value in variable_registry.items():
         var_value = var_value.replace("<" + reg_var_name + ">", str(reg_var_value))
 
@@ -158,11 +167,13 @@ def collect_schemas(dir_path: pathlib.Path) -> OrderedDict[str, MetadataSchema]:
             MetadataSchema.from_file(schema_file_path)
             for schema_file_path in list_schema_file_names(dir_path)
         ],
-        key=lambda schema: schema.name,
+        key=lambda schema: (schema.order, schema.name.capitalize()),
+        # name is capitalized to make sure that the order is
+        # alphabetically sorted in a non-case-sensitive way
     )
     schemas = OrderedDict()
     for metadata_schema in metadata_schemas:
-        schemas[metadata_schema.name] = metadata_schema
+        schemas[metadata_schema.id] = metadata_schema
     return schemas
 
 
diff --git a/src/scicat_offline_ingestor.py b/src/scicat_offline_ingestor.py
index d240688..abc2095 100755
--- a/src/scicat_offline_ingestor.py
+++ b/src/scicat_offline_ingestor.py
@@ -146,11 +146,16 @@ def main() -> None:
             )
 
         # Collect data-file descriptions
+        if not config.ingestion.file_handling.use_full_file_path:
+            source_folder = variable_map["source_folder"]
+        else:
+            source_folder = None
+
         data_file_list = create_data_file_list(
             nexus_file=nexus_file_path,
             ingestor_directory=ingestor_directory,
             config=fh_options,
-            source_folder=variable_map["source_folder"],
+            source_folder=source_folder,
             logger=logger,
             # TODO: add done_writing_message_file and nexus_structure_file
         )
diff --git a/tests/test_scicat_metadata_schema.py b/tests/test_scicat_metadata_schema.py
index 7d8876c..04c7a20 100644
--- a/tests/test_scicat_metadata_schema.py
+++ b/tests/test_scicat_metadata_schema.py
@@ -48,17 +48,25 @@ def test_collect_metadata_schema() -> None:
     assert len(schemas) == len(ALL_SCHEMA_EXAMPLES)
     for schema_name, schema in schemas.items():
         assert isinstance(schema, MetadataSchema)
-        assert schema_name == schema.name
+        assert schema_name == schema.id
 
     assert isinstance(schemas, OrderedDict)
-    # Check if the schema is ordered by the schema name
-    assert list(schemas.keys()) == sorted(schemas.keys())
+    # Check if the schema is ordered by the schema order and name.
+    # The expected keys are hardcoded on purpose.
+    # Always hardcode the expected keys to avoid the test being too flexible.
+    assert list(schemas.keys()) == [
+        "715ce7ba-3f91-11ef-932f-37a5c6fd60b1",  # Coda, 1, Coda Metadata Schema
+        "72a991ee-437a-11ef-8fd2-1f95660accb7",  # Dream, 1, dream Metadata Schema
+        "c5bed39a-4379-11ef-ba5a-ffbc783163b6",  # Base, 1, Generic metadata schema
+        "891322f6-437a-11ef-980a-7bdc756bd0b3",  # Loki, 1, Loki Metadata Schema
+    ]
 
 
 def test_metadata_schema_selection() -> None:
     schemas = OrderedDict(
         {
             "schema1": MetadataSchema(
+                order=1,
                 id="schema1",
                 name="Schema 1",
                 instrument="",
@@ -67,6 +75,7 @@ def test_metadata_schema_selection() -> None:
                 schema={},
             ),
             "schema2": MetadataSchema(
+                order=2,
                 id="schema2",
                 name="Schema 2",
                 instrument="",
@@ -75,6 +84,7 @@ def test_metadata_schema_selection() -> None:
                 schema={},
             ),
             "schema3": MetadataSchema(
+                order=3,
                 id="schema3",
                 name="Schema 3",
                 instrument="",
@@ -96,6 +106,7 @@ def test_metadata_schema_selection_wrong_selector_target_name_raises() -> None:
             OrderedDict(
                 {
                     "schema1": MetadataSchema(
+                        order=1,
                         id="schema1",
                         name="Schema 1",
                         instrument="",
@@ -115,6 +126,7 @@ def test_metadata_schema_selection_wrong_selector_function_name_raises() -> None
             OrderedDict(
                 {
                     "schema1": MetadataSchema(
+                        order=1,
                         id="schema1",
                         name="Schema 1",
                         instrument="",