{
    "source": {
        "type": "file",
        "location": "sample-catalog.pdf",
        "filename": "sample-catalog.pdf"
    },
    "metadata": {
        "Producer": "Prince 8.1 (www.princexml.com)",
        "Title": "Prince Furniture Catalogue",
        "Pages": 4
    },
    "references": {
        "url": [
            "www.princexml.com"
        ]
    }
}