Sometime you want a configuration field to have multiple value, and you want to make it easy for administrators to input instead of separating values by delimiter like commas. You can use frontend_model to make a repeatable field For example in system.xml you can do like this And override the function _prepareToRender And in configuration […]

It’s recommended that we should always query entities by searchCriteria because it will add additional data like extension attributes.

Check for the whole merged dom content in You can observe the value of $this->dom and see if any tag doesn’t meet requirements stated in xsd extension files