web.xml 文件報錯：Referenced file contains errors、cvc-id.3:A field of identity constraint

引言：導入maven工程，web.xml 報了三個錯誤！錯誤截圖如下：    1.Referenced file contains errors (file:/D:/MyEclipse+/MyEclipse/configuration/org.eclipse.osgi/980/0/.cp/dtdsAndSchemas/  web-app_3_0.xsd). For more information

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