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XML with correct syntax is Well Formed XML.
XML validated against a DTD is Valid XML.
Well Formed XML Documents
A "Well Formed" XML document has correct XML syntax.
A "Well Formed" XML document is a document that conforms to
the XML syntax rules that 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 always be quoted
<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
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Valid XML Documents
A "Valid" XML document also conforms to a DTD.
A "Valid" XML document is a "Well Formed" XML document, which
also conforms to the rules of a Document Type Definition (DTD):
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE note SYSTEM "InternalNote.dtd">
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
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XML DTD
A DTD defines the legal elements of an XML document.
The purpose of a DTD is to define the legal building blocks
of an XML document. It defines the document structure with a
list of legal elements.
XML Schema
XML Schema is an XML based alternative to DTD.
W3C supports an alternative to DTD called XML Schema.
A General XML Validator
To help you check the syntax of your xml files, we have
created this link so that you can
syntax-check any
XML file. |
