you have to first modify the default Eclipse configuration to avoid XML cosmetic errors:

you have to first modify the default Eclipse configuration to avoid XML cosmetic errors:

Configure XML Validation to Avoid Cosmetic Errors
Navigate to: Window->Preferences->XML->XML Files->Validation
Uncheck "Honour all XML schema locations"

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原文地址：https://www.cnblogs.com/gangzi2013/p/6489139.html