我集成了nifi opc ua[https://github.com/wadesalazar/nifi-opcua]使用ApacheNIFI 1.3的处理器。我关注以下url[https://community.hortonworks.com/articles/90355/collect-data-from-opc-ua-protocol.html]开始吧。我在windows上安装了prosys opc-ua的模拟opc服务器。
我能够从nifi上的getnodeids处理器提取消息，splittext处理器被用于逐行读取消息并发送到getvalue处理器，如示例所示，但是我的getvalue处理器不断抛出下面的错误。
我试图在getnodeids处理器中设置“starting node”属性，但无法确定应该设置什么节点属性，请在下面找到来自模拟服务器的示例数据。
从模拟opc服务器接收的样本数据：
nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=85- nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2253- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2004- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2007- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2009- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2010- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2011- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2012- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11489- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11527- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2006- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2742- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2005- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2008- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2256- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2138- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2257- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2258- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2259- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2260- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2992- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2993- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2268- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2013- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2996- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2997- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11192- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11704- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2271- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2272- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2736- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2269- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2737- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=3704- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11703- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2735- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11702- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2274- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2020- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2275- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2290- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=3706- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2294- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2295- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2033- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2296- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2034- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=3709- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11313- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11314- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11312- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11492- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11493- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11494- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11715- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=11645- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12637- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12581- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12642- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12672- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12675- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12641- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12710- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12639- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12640- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=12711- - ns=2;s=MyObjectsFolder- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=2;s=MyDevice- - - ns=2;s=MyDevice- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2255- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=68- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2994- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=68- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2254- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=68- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=2267- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=68- ns=2;s=MyObjectsFolder- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - ns=2;s=MyDevice- - - ns=2;s=MyDeviceType- - - ns=2;s=MyEnumObject- - - ns=2;s=MyLevel- - - ns=2;s=MyLevel- - - ns=2;s=MyLevel.Alarm- - - ns=2;s=MyMethod- - - ns=2;s=MySwitch- - ns=2;s=MyDevice- - - ns=2;s=MyDeviceType- - - ns=2;s=MyEnumObject- - - ns=2;s=MyLevel- - - ns=2;s=MyLevel- - - ns=2;s=MyLevel.Alarm- - - ns=2;s=MyMethod- - - ns=2;s=MySwitch- ns=3;s=StaticData- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - ns=3;s=AccessLevels- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=AccessLevelCurrentRead- - - ns=3;s=AccessLevelCurrentReadNotUser- - - ns=3;s=AccessLevelCurrentReadWrite- - - ns=3;s=AccessLevelCurrentWrite- - - ns=3;s=AccessLevelCurrentWriteNotUser- - ns=3;s=AnalogItemArrays- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=ByteAnalogItemArray- - - ns=3;s=DoubleAnalogItemArray- - - ns=3;s=FloatAnalogItemArray- - - ns=3;s=Int16AnalogItemArray- - - ns=3;s=Int32AnalogItemArray- - - ns=3;s=Int64AnalogItemArray- - - ns=3;s=SByteAnalogItemArray- - - ns=3;s=UInt16AnalogItemArray- - - ns=3;s=UInt32AnalogItemArray- - - ns=3;s=UInt64AnalogItemArray- - ns=3;s=AnalogItems- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=ByteAnalogItem- - - ns=3;s=DoubleAnalogItem- - - ns=3;s=FloatAnalogItem- - - ns=3;s=Int16AnalogItem- - - ns=3;s=Int32AnalogItem- - - ns=3;s=Int64AnalogItem- - - ns=3;s=SByteAnalogItem- - - ns=3;s=Sample Instrument Int32AnalogItem- - - ns=3;s=UInt16AnalogItem- - - ns=3;s=UInt32AnalogItem- - - ns=3;s=UInt64AnalogItem- - ns=3;s=DataItems- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=BooleanDataItem- - - ns=3;s=ByteDataItem- - - ns=3;s=ByteStringDataItem- - - ns=3;s=DateTimeDataItem- - - ns=3;s=DoubleDataItem- - - ns=3;s=FloatDataItem- - - ns=3;s=GUIDDataItem- - - ns=3;s=Int16DataItem- - - ns=3;s=Int32DataItem- - - ns=3;s=Int64DataItem- - - ns=3;s=SByteDataItem- - - ns=3;s=StringDataItem- - - ns=3;s=UInt16DataItem- - - ns=3;s=UInt32DataItem- - - ns=3;s=UInt64DataItem- - - ns=3;s=XmlElementDataItem- - ns=3;s=DeepFolder- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=DeepObject01- - ns=3;s=MultiStateItems- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=MultiStateDiscreteItem- - ns=3;s=StaticArrayVariables- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=BooleanArray- - - ns=3;s=ByteArray- - - ns=3;s=ByteStringArray- - - ns=3;s=DateTimeArray- - - ns=3;s=DoubleArray- - - ns=3;s=FloatArray- - - ns=3;s=GUIDArrayArray- - - ns=3;s=Int16Array- - - ns=3;s=Int32Array- - - ns=3;s=Int64Array- - - ns=3;s=LocalizedTextArray- - - ns=3;s=QualifiedNameArray- - - ns=3;s=SByteArray- - - ns=3;s=StringArray- - - ns=3;s=UInt16Array- - - ns=3;s=UInt32Array- - - ns=3;s=UInt64Array- - - ns=3;s=VariantArray- - - ns=3;s=XmlElementArray- - ns=3;s=StaticVariables- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=Boolean- - - ns=3;s=Byte- - - ns=3;s=ByteString- - - ns=3;s=DateTime- - - ns=3;s=Double- - - ns=3;s=Duration- - - ns=3;s=Enumeration- - - ns=3;s=Float- - - ns=3;s=GUID- - - ns=3;s=Image- - - ns=3;s=ImageBMP- - - ns=3;s=ImageGIF- - - ns=3;s=ImageJPG- - - ns=3;s=ImagePNG- - - ns=3;s=Int16- - - ns=3;s=Int32- - - ns=3;s=Int64- - - ns=3;s=Integer- - - ns=3;s=LocaleId- - - ns=3;s=LocalizedText- - - ns=3;s=NodeId- - - ns=3;s=Number- - - ns=3;s=QualifiedName- - - ns=3;s=SByte- - - ns=3;s=String- - - ns=3;s=Time- - - ns=3;s=UInt16- - - ns=3;s=UInt32- - - ns=3;s=UInt64- - - ns=3;s=UInteger- - - ns=3;s=UtcTime- - - ns=3;s=Variant- - - ns=3;s=XmlElement- - ns=3;s=TwoStateItems- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - - ns=3;s=TwoStateDiscreteItem- ns=4;s=NonUaNodeComplianceTest- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - ns=4;s=ByteString- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=SByte- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Time- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=String- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Int16- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Image- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=DateTime- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=LocalizedText- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=UtcTime- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=LocaleId- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=ImageGIF- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Number- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Int32- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=ImageBMP- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=UInteger- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Boolean- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=UInt64- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Enumeration- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=QualifiedName- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=GUID- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Duration- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Double- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Variant- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Integer- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Float- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=ImagePNG- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Int64- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=Byte- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=NodeId- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=XmlElement- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=UInt16- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=ImageJPG- - - ns=4;s=NonUaNodeDataItemType- - ns=4;s=UInt32- - - ns=4;s=NonUaNodeDataItemType- ns=5;s=85/0:Simulation- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - ns=5;s=Counter1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Expression1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Random1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Sawtooth1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=SimulationServerNode11- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Sinusoid1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Square1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- - ns=5;s=Triangle1- - - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63- ns=6;s=MyBigNodeManager- - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=61- - ns=6;s=DataItem_0000- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0001- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0002- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0003- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0004- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0005- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0006- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0007- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0008- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0009- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0010- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0011- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0012- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0013- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0014- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0015- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0016- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0017- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0018- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0019- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0020- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0021- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0022- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0023- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0024- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0025- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0026- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0027- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0028- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0029- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0030- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0031- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0032- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0033- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0034- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0035- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0036- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0037- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0038- - - ns=6;s=DataItemType- - ns=6;s=DataItem_0039- - - ns=6;s=DataItemType
例外情况：
2017-07-25 18:03:10,189 ERROR [Timer-Driven Process Thread-8] c.k.nifi.nifi_opcua_bundle.GetValue GetValue[id=55c6ac28-015d-1000-076b-844ca709cc40] GetValue[id=55c6ac28-015d-1000-076b-844ca709cc40] failed to process due to java.lang.IllegalArgumentException: Invalid string representation of a nodeId: - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63; rolling back session: {}java.lang.IllegalArgumentException: Invalid string representation of a nodeId: - nsu=http%3A%2F%2Fopcfoundation.org%2FUA%2F;i=63at org.opcfoundation.ua.builtintypes.NodeId.parseNodeId(NodeId.java:383)at com.kentender.nifi.nifi_opcua_services.StandardOPCUAService.getValue(StandardOPCUAService.java:346)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:497)at org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:89)at com.sun.proxy.$Proxy78.getValue(Unknown Source)at com.kentender.nifi.nifi_opcua_bundle.GetValue$2.process(GetValue.java:160)at org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2529)at com.kentender.nifi.nifi_opcua_bundle.GetValue.onTrigger(GetValue.java:156)at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1120)at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:147)at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
1条答案
按热度按时间9cbw7uwe1#
'nsu=http%3a%2f%2fopcfoundation.org%2fua%2f；i=63'表示expandednodeid，因此nifi代码应该使用expandednodeid.parseexpandednodeid（）而不是nodeid.parsenodeid（）。
或者，您需要将expandednodeid转换为nodeid，然后再将其传递给getvalue（）。不幸的是，我不熟悉nifi，所以我不确定哪种方法是正确的。
这个问题源于opc-ua的“二元论”——一些服务（如browse）提供expandednodeid引用，而其他服务（如read）则希望获得nodeid示例。
expandednodeid可以将名称空间定义为uri（字符串中的“nsu”）或index（字符串中的“ns”），其中as nodeid只能将名称空间定义为索引。