Indexing inconsistency

I've noticed an inconsistency in the spec topics about indexing.
      I used bold formatting to draw your attention to the relevant
      bits:

    

    
3.5.3.5 <sort-as> (http://docs.oasis-open.org/dita/dita/v1.3/errata01/os/complete/part3-all-inclusive/langRef/base/sort-as.html)

    Processors SHOULD expect to encounter <sort-as> elements in
    the above locations. Processors that sort SHOULD use the following
    precedence rules:

    

      
        
A <sort-as> element that is specified in a title takes
          precedence over a <sort-as> element that is specified as
          a child of the topic prolog.

        
Except for instances in the topic prolog, processors only
          apply <sort-as> elements that are either a direct child
          of the element to be sorted or a direct child of the title- or
          label-defining element of the element to be sorted.

        
When an element contains multiple, direct-child,
            <sort-as> elements, the first direct-child
            <sort-as> element in document order takes precedence.

        
When located within the <indexterm> element, the
          <sort-as> element is equivalent to
          <index-sort-as>. It is an error for an <indexterm>
          element to directly contain both <sort-as> and
          <index-sort-as> elements.

        
Sort phrases are determined after filtering and content
          reference resolution occur.

      
      
3.4.2.5 <index-sort-as> (http://docs.oasis-open.org/dita/dita/v1.3/errata01/os/complete/part3-all-inclusive/langRef/base/index-sort-as.html)

      
It is an error if there is more than one <index-sort-as>
        child for a given <indexterm>. An implementation might
          give an error message, and might recover from this error
          condition by ignoring all but the last <index-sort-as>.

      

      Best,

      Kris

      

      Kristen James Eberlein

      Chair, OASIS DITA Technical Committee

      Principal consultant, Eberlein Consulting

      www.eberleinconsulting.com

      +1 919 622-1501; kriseberlein (skype)