Enhancement: support XML schema validate during parse

[DQinYuan]

Expected behavior and actual behavior:

Support set XML shcema validation during parse.

Versions:

• jOOX: 1.6.0
• Java: 8

[lukaseder]

Thank you very much for your suggestion.

What would be the use case for this validation, when using jOOX? Notice that you can easily pass a previously validated org.w3c.dom.Document to JOOX.$(), too.

[DQinYuan]

I got it. Thanks.