(Swift) Extract Metadata XML from PDF

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let pdf = CkoPdf()!

    var success: Bool = pdf.loadFile("qa_data/pdf/blank_with_metadata.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    let sbXml = CkoStringBuilder()!
    // Note: Not all PDF files have metadata.  Metadata is optional.
    success = pdf.getMetadata(sbXml)
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    let xml = CkoXml()!
    xml.loadSb(sbXml, autoTrim: true)

    print("\(xml.getXml()!)")

    // Sample PDF metadata XML:
    // (Code for parsing follows)

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    // <?xml version="1.0" encoding="utf-8"?>
    // <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 9.1-c001 79.675d0f7, 2023/06/11-19:21:16        ">
    //     <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    //         <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/" xmlns:pdf="http://ns.adobe.com/pdf/1.3/" xmlns:xmpRights="http://ns.adobe.com/xap/1.0/rights/">
    //             <xmp:ModifyDate>2024-11-27T11:33:12-06:00</xmp:ModifyDate>
    //             <xmp:CreateDate>2024-11-27T11:28:23-06:00</xmp:CreateDate>
    //             <xmp:MetadataDate>2024-11-27T11:33:12-06:00</xmp:MetadataDate>
    //             <xmp:CreatorTool>Adobe Acrobat Pro (32-bit) 24.3.20112</xmp:CreatorTool>
    //             <dc:format>application/pdf</dc:format>
    //             <dc:title>
    //                 <rdf:Alt>
    //                     <rdf:li xml:lang="x-default">Blank</rdf:li>
    //                 </rdf:Alt>
    //             </dc:title>
    //             <dc:creator>
    //                 <rdf:Bag>
    //                     <rdf:li>Chilkat Software</rdf:li>
    //                 </rdf:Bag>
    //             </dc:creator>
    //             <dc:description>
    //                 <rdf:Alt>
    //                     <rdf:li xml:lang="x-default">Blank Document</rdf:li>
    //                 </rdf:Alt>
    //             </dc:description>
    //             <dc:subject>
    //                 <rdf:Bag>
    //                     <rdf:li>blank</rdf:li>
    //                     <rdf:li>metadata</rdf:li>
    //                     <rdf:li>document</rdf:li>
    //                 </rdf:Bag>
    //             </dc:subject>
    //             <xmpMM:DocumentID>uuid:34535ffa-b632-43f1-b1fd-80cea6fdc351</xmpMM:DocumentID>
    //             <xmpMM:InstanceID>uuid:69ace620-4c54-407f-8d45-6eebc90f34c2</xmpMM:InstanceID>
    //             <pdf:Producer>Adobe Acrobat Pro (32-bit) 24.3.20112</pdf:Producer>
    //             <pdf:Keywords>blank; metadata; document</pdf:Keywords>
    //             <xmpRights:WebStatement>https://www.chilkatsoft.com/</xmpRights:WebStatement>
    //         </rdf:Description>
    //     </rdf:RDF>
    // </x:xmpmeta>

    var x_xmpmeta_xmlns_x: String? = xml.getAttrValue("xmlns:x")
    var x_xmpmeta_x_xmptk: String? = xml.getAttrValue("x:xmptk")
    var rdf_RDF_xmlns_rdf: String? = xml.chilkatPath("rdf:RDF|(xmlns:rdf)")
    var rdf_Description_rdf_about: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(rdf:about)")
    var rdf_Description_xmlns_xmp: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(xmlns:xmp)")
    var rdf_Description_xmlns_dc: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(xmlns:dc)")
    var rdf_Description_xmlns_xmpMM: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(xmlns:xmpMM)")
    var rdf_Description_xmlns_pdf: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(xmlns:pdf)")
    var rdf_Description_xmlns_xmpRights: String? = xml.chilkatPath("rdf:RDF|rdf:Description|(xmlns:xmpRights)")
    var xmp_ModifyDate: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmp:ModifyDate")
    var xmp_CreateDate: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmp:CreateDate")
    var xmp_MetadataDate: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmp:MetadataDate")
    var xmp_CreatorTool: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmp:CreatorTool")
    var dc_format: String? = xml.getChildContent("rdf:RDF|rdf:Description|dc:format")
    var rdf_li_xml_lang: String? = xml.chilkatPath("rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li|(xml:lang)")
    var rdf_li: String? = xml.getChildContent("rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li")
    rdf_li = xml.getChildContent("rdf:RDF|rdf:Description|dc:creator|rdf:Bag|rdf:li")
    rdf_li_xml_lang = xml.chilkatPath("rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li|(xml:lang)")
    rdf_li = xml.getChildContent("rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li")
    var i: Int = 0
    var count_i: Int = xml.numChildrenHavingTag("rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li").intValue
    while i < count_i {
        xml.i = i
        rdf_li = xml.getChildContent("rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li[i]")
        i = i + 1
    }

    var xmpMM_DocumentID: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmpMM:DocumentID")
    var xmpMM_InstanceID: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmpMM:InstanceID")
    var pdf_Producer: String? = xml.getChildContent("rdf:RDF|rdf:Description|pdf:Producer")
    var pdf_Keywords: String? = xml.getChildContent("rdf:RDF|rdf:Description|pdf:Keywords")
    var xmpRights_WebStatement: String? = xml.getChildContent("rdf:RDF|rdf:Description|xmpRights:WebStatement")

}