[2.0]XML schema validation seems too strict

[rupeshwankhede]

BC Break Report

Q	A
BC Break	yes
Version	2.0.1
--

Summary

After updating version 2.0. Getting exception for below line. It is working on previous version.
XML Schema validation throw an exception about this line

<field field-name="created" type="date" name="created"> <gedmo:timestampable on="create"/> </field>

Previous behavior

There wasn't any error about that line in previous versions. We just return.
if (@$document->schemaValidate(__DIR__ . '/../../../../../../doctrine-mongo-mapping.xsd')) { return; }

Current behavior

In current version throwing exception.
if (! $document->schemaValidate(__DIR__ . '/../../../../../../doctrine-mongo-mapping.xsd')) { throw MappingException::xmlMappingFileInvalid($filename, $this->formatErrors(libxml_get_errors())); }
I don't know if it's possible, but maybe the validation should be less strict same like in ORM.

Refer: #2095

[malarzm]

Well, there's still no resolution in doctrine-extensions/DoctrineExtensions#2055 for which we hoped. I believe the only tangible thing we can do is to let users opt-out from the XSD validation, but that's obviously a footgun.

[rupeshwankhede]

Yeah. Can we do that if it is possible?

[malarzm]

Sure, are you up for the implementation?

[rupeshwankhede]

@malarzm Can you check PR and let us know if we need to change anything.
https://github.com/doctrine/mongodb-odm/pull/2535/files