dubbo.xsd下载 dubbo约束文件 解决了eclipse使用不了标签的问题 解决dubbo报错 be found for element 'dubbo:application'. - schema_reference.4: Failed to read schema document 'http://code.alibabatech.com/schema/dubbo/dubbo.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element