[MNG-7268] maven.xsd Content for Maven 4.X

**[Karl Heinz Marbaise](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=khmarbaise)** opened **[MNG-7268](https://issues.apache.org/jira/browse/MNG-7268?redirect=false)** and commented

If you use the option in Maven 4.0.0 (master of core) to remove the versions from parent entries IDE's for example IntelliJ (I suppose Eclipse will do the same) shows an issue related to the missing version tag which is obvious based on the given XSD in the used pom.xml (https://maven.apache.org/xsd/maven-4.0.0.xsd) because the given XSD defines the version tag in parents as required which is not the case anymore with Maven 4.X where you can omit the version tag.

So we need to deploy a new versions of maven.xsd file to handle issues like this. Maybe we need to do more?

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**Affects:** 3.0-alpha-1