     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

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

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