diff --git a/src/rougail/structural_string/__init__.py b/src/rougail/structural_string/__init__.py
new file mode 100644
index 000000000..1c07332cb
--- /dev/null
+++ b/src/rougail/structural_string/__init__.py
@@ -0,0 +1,115 @@
+"""
+Silique (https://www.silique.fr)
+Copyright (C) 2025-2026
+
+This program is free software: you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by the
+Free Software Foundation, either version 3 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 Lesser General Public License for more
+details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
+from typing import List, Optional
+from itertools import chain
+from ruamel.yaml import YAML
+
+from ..tiramisu import normalize_family
+from ..convert.path import Paths
+#from ..error import DictConsistencyError
+#from ..i18n import _
+
+
+class Walker:
+    def __init__(
+        self,
+        convert,
+    ) -> None:
+        """Parse directories content"""
+        self.convert = convert
+        self.yaml = YAML()
+        rougailconfig = self.convert.rougailconfig
+        if rougailconfig["main_namespace"]:
+            self.convert.has_namespace = True
+            self.convert.paths = Paths(
+                rougailconfig["main_namespace"],
+                rougailconfig["isolated_namespace"],
+            )
+            self.load_with_extra(
+                rougailconfig["extra_namespaces"],
+                rougailconfig["main_namespace"],
+                rougailconfig["main_structural_strings"],
+            )
+        else:
+            self.convert.namespace = None
+            namespace_path = ""
+            if namespace_path in self.convert.parents:
+                raise Exception("pfff")
+            for string in rougailconfig["main_structural_strings"]:
+                self.parse_variable(
+                    string,
+                    namespace_path,
+                )
+
+    def load_with_extra(
+        self,
+        extra_structures: dict,
+        main_namespace: str,
+        main_strings: Optional[List[str]] = None,
+    ) -> None:
+        directory_dict = chain(
+            (
+                (
+                    main_namespace,
+                    main_strings,
+                ),
+            ),
+            extra_structures.items(),
+        )
+        for namespace, extra_objects in directory_dict:
+            namespace_path = normalize_family(namespace)
+            if namespace_path in self.convert.parents:
+                raise Exception("pfff")
+            self.convert.namespace = namespace_path
+            for idx, string in enumerate(extra_objects):
+                if not idx:
+                    # create only for the first file
+                    self.convert.create_namespace(namespace, namespace_path)
+                self.parse_variable(
+                    string,
+                    namespace_path,
+                )
+
+    def parse_variable(
+        self,
+        string: str,
+        path: str,
+    ) -> None:
+        objects = self.yaml.load(string)
+        if objects is None:
+            return
+        if path:
+            name = f'yaml file for {path}'
+        else:
+            name = 'yaml file'
+        version = self.convert.validate_file_version(
+            objects,
+            name,
+        )
+        self.convert.parse_root_file(
+            [name],
+            path,
+            version,
+            objects,
+        )
+
+
+__all__ = ("Walker",)
+
diff --git a/src/rougail/structural_string/config.py b/src/rougail/structural_string/config.py
new file mode 100644
index 000000000..a2e5f85d7
--- /dev/null
+++ b/src/rougail/structural_string/config.py
@@ -0,0 +1,69 @@
+"""
+Silique (https://www.silique.fr)
+Copyright (C) 2025-2026
+
+This program is free software: you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by the
+Free Software Foundation, either version 3 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 Lesser General Public License for more
+details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+from ..utils import _
+
+
+def get_rougail_config(
+    *,
+    backward_compatibility=True,
+) -> dict:
+    if backward_compatibility:
+        main_namespace_default = "rougail"
+    else:
+        main_namespace_default = "null"
+    options = f"""
+main_structural_strings:
+  description: {_("Structural files contents")}
+  help: {_("This variable is a list of string with YAML file format")}
+  multi: true
+  disabled:
+    jinja: >-
+      {{% if 'string' not in _.step.structural %}}
+        true
+      {{% elif cli is defined and cli.versions is defined and cli.versions %}}
+        true
+      {{% else %}}
+        false
+      {{% endif %}}
+    return_type: boolean
+    description: {_('string is not in "_.step.structural"')}
+
+extra_namespaces:
+
+  strings:
+    description: {_("Extra structural contents")}
+    help: {_("This variable is a list of string with YAML file format")}
+    alternative_name: xc
+    multi: true
+    disabled:
+      jinja: >-
+        {{{{ 'string' not in __.step.structural }}}}
+      return_type: boolean
+      description: {_('string is not in "__.step.structural"')}
+"""
+    return {
+        "name": "string",
+        "process": "structural",
+        "options": options,
+        "level": 15,
+    }
+
+
+__all__ = "get_rougail_config"
+