XML Validator
Well Formed XML Documents
An XML document with correct syntax is called "Well Formed".
The syntax rules were described in the previous chapters:
- XML documents must have a root element
- XML elements must have a closing tag
- XML tags are case sensitive
- XML elements must be properly nested
- XML attribute values must be quoted
XML Errors Will Stop You
Errors in XML documents will stop your XML applications.
The W3C XML specification states that a program should stop processing an XML document if it finds an error. The reason is that XML software should be small, fast, and compatible.
Syntax-Check Your XML
To help you syntax-check your XML, we have created an XML validator.
Try to syntax-check correct XML :
Try to syntax-check incorrect XML :
Try to syntax-check your own XML :
Valid XML Documents
A "well formed" XML document is not the same as a "valid" XML document.
A "valid" XML document must be well formed. In addition, it must conform to a document type definition.
There are two different document type definitions that can be used with XML:
- DTD - The original Document Type Definition
- XML Schema - An XML-based alternative to DTD
A document type definition defines the rules and the legal elements and attributes for an XML document.
