Web Services Description Language - Wikipedia
SOAP Proxy - XML content validator download for Linux
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XML Validator Tool to validate XML online: XML Lint
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Free Online XML Validator (Well formed)
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Validating SOAP Services | SOAP and WSDL | SoapUI
Online SOAP client - Test SOAP API
Working with WSDL Files | Documentation | SoapUI
Get Started With SOAP and WSDL Testing in SoapUI | SoapUI
Advanced JSON Online Formatter & Validator | Bypeople
