[MNG-7114] Publish XSDs as artifact to Central

**[Andreas Sewe](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=asewe)** opened **[MNG-7114](https://issues.apache.org/jira/browse/MNG-7114?redirect=false)** and commented

At the moment, a number of XML Schema files for descriptor-like file formats like archetype or assembly descriptors are only available at https://maven.apache.org/xsd/.

This makes them hard to consume, for example, by the `xml:validate` goal, which is IMHO quite well suited for sanity-checking your descriptor files before packaging and subsequently releasing them.

Would it be possible to release the XSDs under `org.apache.maven:maven-xsd` or a similar coordinate?

---
No further details from [MNG-7114](https://issues.apache.org/jira/browse/MNG-7114?redirect=false)

Start with the XSDs currently published at https://maven.apache.org/xsd/ and the xml:validate goal, then trace how Maven artifacts are released to Central. Done means the descriptor XSDs are available under a usable coordinate such as org.apache.maven:maven-xsd and can be consumed for validation.

Written by the indexing model from the issue text.