No grammar constraints (DTD or XML schema) detected for the document

Eclipse关闭No grammar constraints (DTD or XML schema) detected for the document警告

"Warning: No grammar constraints (DTD or XML schema) detected for thedocument."
可以在Eclipse工具栏中
Windows - Preferences - XML - XML Files - Validate files - Indicate when no grammar is specified
选择ignore
来关闭这个警告