     
     
     // MARK: - XMLParserDelegate
+    
+    func parserDidStartDocument(_ parser: XMLParser) {
+        NSLog("parserDidStartDocument called")
+    }
     
     func parser(_ parser: XMLParser,
                 didStartElement elementName: String,

            
            if !success {
                guard let error = parser.parserError
                    else { throw GXLReaderError.parsingFailed }
                throw error
            }
            

    let relationshipKey = "edge"
    let propertyKey = "attr"
    
    // TODO
    //let osLog = OSLog(subsystem: "net.zehrer.graphdb.plist", category: "testing")
    //os_log("TEXT", log: osLog, type: .debug)
    
    // MARK: -
    
    let store: XMLFileStore
