显示错误为“XML Parsing Error: not well-formed

Question

我在 localhost 中尝试了一个 xml 文档，但它显示错误为“XML Parsing Error: not well-formed 地点：http://localhost/xml/user.php ，第 4 行，第 906 列：

我搜索了 xml 文件结构中的任何错误，例如缺少结束标记。但我找不到。

但是当我在没有 php 标签的浏览器中运行这个 xml 文件（不删除任何元素 - 原始 xml 文件）时。它运行良好，并在浏览器中显示树结构。

我的代码如下；

<?php
header("Content-type: text/xml");
echo "<?xml version='1.0' encoding='UTF-8'?>";
echo "<xs:schema
xmlns='http://www.google.com'
xmlns:xs='http://www.google.com'
xs:schemaLocation='http://www.google.com'>";
echo "    <xs:user>";
echo "        <xs:element1 name='username'>";
echo "            <xs:simpleType>";
echo "                <xs:restriction base='xs:string'>";
echo "                  <xs:minLength value='5'/>";
echo "                  <xs:maxLength value='12'/>";
echo "                  <xs:pattern value='[a-zA-Z0-9]'/>";
echo "                  <xs:whiteSpace value='collapse'/>";
echo "              </xs:restriction>";
echo "            </xs:simpleType>";
echo "      </xs:element1>";
echo "      <xs:element2 name='password'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string'>";
echo "                  <xs:pattern value='[a-zA-Z0-9]'/>";
echo "                  <xs:minLength value='8'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element2>";
echo "      <xs:element3 name='fullname' type='xs:string'/>";   
echo "      <xs:element4 name='initials'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string'>";
echo "                  <xs:pattern value='[A-Z][A-Z][A-Z]'/>";
echo "                  <xs:whiteSpace value='collapse'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element4>";
echo "      <xs:element5 name='gender'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string>";
echo "                  <xs:pattern value='male|female'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element5>";            
echo "  </xs:user>";
echo "</xs:schema>";
?>

Answer 1

你在这里错过了一个单引号 <xs:restrictions base='xs:string'> 并且还从第 4 行中删除了换行符

这是你的xml

<?php
header("Content-type: text/xml");
echo '<?xml version="1.0" encoding="UTF-8"?>';
echo '<xs:schema xmlns="http://www.google.com" xmlns:xs="http://www.google.com" xs:schemaLocation="http://www.google.com">';
echo "    <xs:user>";
echo "        <xs:element1 name='username'>";
echo "            <xs:simpleType>";
echo "                <xs:restriction base='xs:string'>";
echo "                  <xs:minLength value='5'/>";
echo "                  <xs:maxLength value='12'/>";
echo "                  <xs:pattern value='[a-zA-Z0-9]'/>";
echo "                  <xs:whiteSpace value='collapse'/>";
echo "              </xs:restriction>";
echo "            </xs:simpleType>";
echo "      </xs:element1>";
echo "      <xs:element2 name='password'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string'>";
echo "                  <xs:pattern value='[a-zA-Z0-9]'/>";
echo "                  <xs:minLength value='8'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element2>";
echo "      <xs:element3 name='fullname' type='xs:string'/>";   
echo "      <xs:element4 name='initials'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string'>";
echo "                  <xs:pattern value='[A-Z][A-Z][A-Z]'/>";
echo "                  <xs:whiteSpace value='collapse'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element4>";
echo "      <xs:element5 name='gender'>";
echo "          <xs:simpleType>";
echo "              <xs:restrictions base='xs:string'>";
echo "                  <xs:pattern value='male|female'/>";
echo "              </xs:restrictions>";
echo "          </xs:simpleType>";
echo "      </xs:element5>";            
echo "  </xs:user>";
echo "</xs:schema>";
?>