"""Get the leaf structural nodes of a node."""
            if _is_structural(node) and not _has_structural_descendant(node):
                return [node]
            else:
                leaf_nodes = []
                for child in node:
                    leaf_nodes.extend(_leaf_structural_nodes(child))
                return leaf_nodes
        def _create_doc(node: Any, text: str) -> Document:
            """Create a Document from a node and text."""
            metadata = {
                XPATH_KEY: _xpath_for_chunk(node),
                DOCUMENT_ID_KEY: document[DOCUMENT_ID_KEY],
                DOCUMENT_NAME_KEY: document[DOCUMENT_NAME_KEY],
                DOCUMENT_SOURCE_KEY: document[DOCUMENT_NAME_KEY],
                STRUCTURE_KEY: node.attrib.get("structure", ""),
                TAG_KEY: re.sub(r"\{.*\}", "", node.tag),
            }
            if doc_metadata:
                metadata.update(doc_metadata)
            return Document(
                page_content=text,
                metadata=metadata,
            )
        # parse the tree and return chunks
        tree = etree.parse(io.BytesIO(content))
        root = tree.getroot()
        chunks: List[Document] = []
        prev_small_chunk_text = None
        for node in _leaf_structural_nodes(root):
            text = _get_text(node)
            if prev_small_chunk_text:
                text = prev_small_chunk_text + " " + text
                prev_small_chunk_text = None
            if _is_heading(node) or len(text) < self.min_chunk_size:
                # Save headings or other small chunks to be appended to the next chunk
                prev_small_chunk_text = text
            else:
                chunks.append(_create_doc(node, text))
        if prev_small_chunk_text and len(chunks) > 0: