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| control structure | repeat over data-attributes | ||||
Syntax
  repeat over specified? data-attributes (of attribute-reference
     element-qualifier*)? as alias-name
     local-declaration*
     action*
  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 action. Any name can be used.
Use of the keyword data-attribute followed by  alias-name, without qualifiers, inside the repeat over data-attributesaction always refers to the attribute identified by the alias. 
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