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W3C XHTML Validator API

The Markup Validator is a free service by W3C that helps check the validity of Web documents. It checks the syntax of Web documents, written in formats such as (X)HTML. The API uses SOAP protocol and responses are formatted in XML.

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W3C XHTML Validator: Highlights

Summary
HTML validation service
Category
Internet
Tags
Protocols
SOAP
Data Formats
XML
API home
http://validator.w3.org/docs/api.html 

W3C XHTML Validator: Specifications

Functionality

Client Install Required
Yes  

Signup and Licensing

Signup Requirements
None  
Developer Key Required
No  
Account Required
No  
Commercial Licensing
 
Provider
www.w3.org/  
Non-Commercial Lic.
 
Data Licensing
 
Usage Fees
 
Program Fees
 
Certification Program
 
Usage Limits
 
Terms of Service
 

Security

Authentication Model
 
SSL Support
 
Read-only Without Login
 

Support

Vendor API Kits
PHP, Perl, C#, ColdFusion 
Community API Kits
 
API Blog
 
Site Blog
 
API Forum
 
Developer Support
 
Console URL
 

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Mashups, Developers & Source Code

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