DocumentMeta

{
    "doc_id": "string",
    "role": "subject",
    "filename": "string",
    "source_url": "string",
    "display_order": 0,
    "page_count": 0,
    "pages": [
        {
            "doc_id": "string",
            "page_index": 0,
            "page_num": 0,
            "global_page_num": 0,
            "image_url": "string",
            "image_width": 0,
            "image_height": 0
        }
    ]
}