JAXB XJC代码生成—由Marshaller生成的xml中缺少的“schemaLocation”。

I Use XJC tool to generate Java classes for my XSD schema. When I use JAXB Marshaller to marshall classes into XML payloads, I'm missing "schemaLocation" parameter in the output XML, but I declare this parameter in xsd file. How to enforce "schemaLocation" parameter in the output XML?I Use XJC tool to generate Java classes for my