chore: change the 'parent' arg type of DoclingDocument functions

Change the 'parent' argument type of the functions in DoclingDocument that allow
adding text items, to enable all type of parent items instead of only group items.

Signed-off-by: Cesar Berrospi Ramis <[email protected]>

Author: ceberam

docling_core/types/doc/document.py

@@ -1408,13 +1408,13 @@ def add_group(
         self,
         label: Optional[GroupLabel] = None,
         name: Optional[str] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ) -> GroupItem:
         """add_group.
 
         :param label: Optional[GroupLabel]:  (Default value = None)
         :param name: Optional[str]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
 
         """
         if not parent:
@@ -1441,15 +1441,15 @@ def add_list_item(
         marker: Optional[str] = None,
         orig: Optional[str] = None,
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ):
         """add_list_item.
 
         :param label: str:
         :param text: str:
         :param orig: Optional[str]:  (Default value = None)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
 
         """
         if not parent:
@@ -1484,15 +1484,15 @@ def add_text(
         text: str,
         orig: Optional[str] = None,
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ):
         """add_text.
 
         :param label: str:
         :param text: str:
         :param orig: Optional[str]:  (Default value = None)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
 
         """
         # Catch a few cases that are in principle allowed
@@ -1536,15 +1536,15 @@ def add_table(
         data: TableData,
         caption: Optional[Union[TextItem, RefItem]] = None,  # This is not cool yet.
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
         label: DocItemLabel = DocItemLabel.TABLE,
     ):
         """add_table.
 
         :param data: TableData:
         :param caption: Optional[Union[TextItem, RefItem]]:  (Default value = None)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
         :param label: DocItemLabel:  (Default value = DocItemLabel.TABLE)
 
         """
@@ -1573,15 +1573,15 @@ def add_picture(
         image: Optional[ImageRef] = None,
         caption: Optional[Union[TextItem, RefItem]] = None,
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ):
         """add_picture.
 
         :param data: List[PictureData]: (Default value = [])
         :param caption: Optional[Union[TextItem:
         :param RefItem]]:  (Default value = None)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
         """
         if not parent:
             parent = self.body
@@ -1611,14 +1611,14 @@ def add_title(
         text: str,
         orig: Optional[str] = None,
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ):
         """add_title.
 
         :param text: str:
         :param orig: Optional[str]:  (Default value = None)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
         """
         if not parent:
             parent = self.body
@@ -1649,7 +1649,7 @@ def add_heading(
         orig: Optional[str] = None,
         level: LevelNumber = 1,
         prov: Optional[ProvenanceItem] = None,
-        parent: Optional[GroupItem] = None,
+        parent: Optional[NodeItem] = None,
     ):
         """add_heading.
 
@@ -1658,7 +1658,7 @@ def add_heading(
         :param orig: Optional[str]:  (Default value = None)
         :param level: LevelNumber:  (Default value = 1)
         :param prov: Optional[ProvenanceItem]:  (Default value = None)
-        :param parent: Optional[GroupItem]:  (Default value = None)
+        :param parent: Optional[NodeItem]:  (Default value = None)
         """
         if not parent:
             parent = self.body