     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

    
    
    // MARK: - XMLParserDelegate
    
    func parser(_ parser: XMLParser,
                didStartElement elementName: String,

            
            if !success {
                guard let error = parser.parserError
                    else {
                        NSLog(url.absoluteString)
                        
                        let line = parser.lineNumber
                        let col = parser.columnNumber
                        
                        NSLog("Line: \(line); Column: \(col)")
                        throw GXLReaderError.parsingFailed
                    }
                throw error
            }
            
