Online XML Schema validation service

During some of my spare time, I've developed and deployed an 'online XML Schema validation service' using Apache Xerces-J as XML Schema (XSD) processor at back-end. This 'online XML Schema validation service' is located at, http://www.softwarebytes.org/xmlvalidation/. The HTTPS version is available here: https://www.softwarebytes.org/xmlvalidation/.

The mentioned 'online XML Schema validation service', also provides REST APIs to be invoked from any program that can issue HTTP POST requests. The 'online XML Schema validation service' referred above, provides downloadable examples written in Python and C# that use the provided REST APIs. The responses from mentioned REST APIs can be in following formats: XML, JSON, plain text (the REST API response format, can be set while issuing HTTP requests).

Interestingly, I've discovered that, the above mentioned REST APIs can be invoked directly via a tool like curl by using its platform binary. With modern computer OSs (for e.g, Windows 10), curl comes pre-installed within the OS. Following are network responses on the command line, for the few curl requests that I issued to the mentioned REST APIs,

curl --form xmlFile=@two_inp_files/x1_valid_1.xml --form xsdFile1=@two_inp_files/x1.xsd --form ver=1.1 --form xsd11CtaFullXPath=no --form responseType=xml https://www.softwarebytes.org/xmlvalidation/api/xsValidationHandler

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<validationReport>
   <xsdVer>1.1</xsdVer>
   <success>
      <message>XML document is assessed as valid with the XSD document(s) that were provided.</message>
   </success>
</validationReport>

curl --form xmlFile=@two_inp_files/x1_invalid_1.xml --form xsdFile1=@two_inp_files/x1.xsd --form ver=1.1 --form xsd11CtaFullXPath=no --form responseType=xml https://www.softwarebytes.org/xmlvalidation/api/xsValidationHandler

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<validationReport>
   <xsdVer>1.1</xsdVer>
   <failure>
      <message>XML document is assessed as invalid with the XSD document(s) that were provided.</message>
      <details>
         <detail_1>[Error] x1_invalid_1.xml:3:5:cvc-assertion: Assertion evaluation ('if (@isB = true()) then b else not(b)') for element 'X' on schema type '#AnonType_X' did not succeed.</detail_1>
      </details>
   </failure>
</validationReport>

curl --form xmlFile=@two_inp_files/x1_valid_1.xml --form xsdFile1=@two_inp_files/x1.xsd --form ver=1.1 --form xsd11CtaFullXPath=no --form responseType=json https://www.softwarebytes.org/xmlvalidation/api/xsValidationHandler

{
    "xsdVer": "1.1",
    "success": {"message": "XML document is assessed as valid with the XSD document(s) that were provided."}
}

curl --form xmlFile=@two_inp_files/x1_invalid_1.xml --form xsdFile1=@two_inp_files/x1.xsd --form ver=1.1 --form xsd11CtaFullXPath=no --form responseType=json https://www.softwarebytes.org/xmlvalidation/api/xsValidationHandler

{
    "xsdVer": "1.1",
    "failure": {
        "details": ["[Error] x1_invalid_1.xml:3:5:cvc-assertion: Assertion evaluation ('if (@isB = true()) then b else not(b)') for element 'X' on schema type '#AnonType_X' did not succeed."],
        "message": "XML document is assessed as invalid with the XSD document(s) that were provided."
    }
}

curl --form xmlFile=@input_small.xml --form xsdFile1=@assert_2.xsd --form ver=1.1 --form xsd11CtaFullXPath=no https://www.softwarebytes.org/xmlvalidation/api/xsValidationHandler

You selected XSD 1.1 validation.

XML document is assessed as valid with the XSD document(s) you have provided.

(please note that, since the last curl request above doesn't specify a command line argument 'responseType', a response formatted as plain text is received from the server API. i.e, a plain text response from this API, is the default response format)

The mentioned 'online XML Schema validation service', supports both 1.0 and 1.1 versions of XML Schema language.