I probably should have omitted alternatives and comments in my example - would have come to the same length then and just as easy to read. Did so below and even more pleasant to read - esp for folks already used to HTML.

Do S-expressions have a schema standard ?

    <proj 
      name="My Biz CLI" 
      url="http://github.com/mybiz/mybizctl" 
      groupId="com.mybiz" 
      artifactId="mybizctl"
      version="1.0.0"
      modelVersion="4.0.0">  
      <deps>  
        <dep groupId="junit" artifactId="junit" version="5.0.1" scope="test" />  
      </deps>  
    </proj>