Type of content Tags
Table without Alt Text
<Table>
  <THead>
    <TR>
      <TH>
        text content
      <TH>
        text content
  <TBody>
    <TR>
      <TH>
        text content
      <TD>
        text content
  <TFoot>
    <TR>
      <TH>
        text content
      <TD>
        text content
Table Header Cell
<TH>
  Scope=Row, Column, 
or Both
Table Merged Cell
<TH> or <TD>
  Row span=r
  Column span=c
Group without Alt Text
tags for child objects
Summary Zoom, Section Zoom, and Slide Zoom
<TOC>
  Alt=alt text
  <TOCI>
      <Link>
        Link - OBJR
        <Span>