No grammar constraints (DTD or XML schema) detected for the document
warning: No grammar constraints (DTD or XML schema) detected for the document
未检测到文档的语法约束(DTD或XML模式)
解决:声明文档格式
<!DOCTYPE xml>
warning: No grammar constraints (DTD or XML schema) detected for the document
未检测到文档的语法约束(DTD或XML模式)
解决:声明文档格式
<!DOCTYPE xml>