cvc-complex-type.4: Attribute ‘version’ must appear on element ‘web-app’.
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XML的编写是否符合规范，可以通过XML Schema或DTD进行验证，但有时候电脑本来就很卡，而且XML的某些错误并未导致程序无法运行的情况下，暂时关闭XML的验证也算不错的选择。
如web.xml中web-app标签没指定version：
<web-app xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xmlns=”http://java.sun.com/xml/ns/j2ee” xsi:schemaLocation=”http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd” id=”WebApp_ID” >
这时，就会出现打红叉，提示：cvc-complex-type.4: Attribute ‘version’ must appear on element ‘web-app’.
这个错误并未导致程序无法运行，而eclipse关闭XML验证的方法如下：
1.菜单【Windows】 -【Preperences】-【Validation】
2.在右边找到“XML Validator”，把取消【Bulid】复选框的选中状态，保持【Manual】 的选中状态，因为我们最后还需要确保XML的正确性，这个可以通过选择XML文件，在右键菜单中选择【Validate】手工来验证，如果XML有错，会弹出窗口提示，但如果把【Manual】复选框也取消的话，再手工验证，即使XML真有错，也不会正确提示。
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