XML Validator
指导
XML Validator
Validate your XML documents instantly for well-formedness and syntax errors. This tool uses a standards-compliant XML parser to check your markup and pinpoint exactly where problems occur, showing line numbers, column positions, and clear error descriptions.
如何使用
Paste or type your XML content into the input area. The validator automatically checks your document as you type and displays results below. If your XML is valid, you will see a green confirmation message. If there are errors, each one is listed with its line number, column position, and a description of the problem. Click “Try an example” to load a sample XML document and see the validator in action.
特征
- 实时验证 – XML is validated automatically as you type, with no need to click a button
- 详细的错误报告 – Errors include line numbers, column positions, and descriptive messages to help you locate and fix issues quickly
- Well-Formedness Checking – Detects unclosed tags, mismatched elements, invalid characters, and other common XML syntax problems
- 客户端处理 – All validation happens in your browser; your XML data is never sent to a server
常问问题
-
What is the difference between well-formed and valid XML?
Well-formed XML follows the basic syntax rules of XML: proper nesting, matching tags, a single root element, and correct attribute quoting. Valid XML goes further by also conforming to a schema or DTD that defines allowed elements and structure. This tool checks for well-formedness.
-
What are the most common XML syntax errors?
The most common errors include unclosed tags, mismatched opening and closing tag names, missing root elements, unescaped special characters like ampersands and angle brackets, and incorrectly quoted attribute values.
-
Why does XML require strict syntax compared to HTML?
XML was designed as a data interchange format where precision matters. Unlike HTML, which browsers can render even with errors, XML parsers are required by specification to reject malformed documents. This strictness ensures data integrity and unambiguous parsing across different systems.
