control structure
repeat over specified? data-attributes of attribute-reference as alias-name
   local-scope
again
    
An action that can be used to iterate over all attributes that:
repeat over data-attributes must specify an alias-name following as.
        This name is used to identify the attribute selected for each iteration within the repeat over
        loop. Any name can be used.
      
Use of the keyword data-attribute followed by  alias-name, without qualifiers,
        inside the repeat over data-attributes loop always refers to the attribute identified by the
        alias.