Fellow NISO STS users,
I just discovered a co-occurrence constraint on rules= here:
https://www.niso-sts.org/TagLibrary/niso-sts-TL-1-0-html/attribute/rules.html
"If there is no @border attribute, then no rules are drawn."
That introduces a dependency on border= not found in HTML as this
group documented with an example:
https://www.geeksforgeeks.org/html-table-rules-attribute/
(I know that site isn't definitive, but it does include a screen shot)
When I implemented the constraint in my stylesheets, all of a sudden
the rules disappeared in a number of publications that specify rules=
without any border= attribute. Sometimes a border is specified using
frame=, and at other times a border is specified using style=, and in
most cases it is quite obvious the rules= property is desired. But
the rules for those all disappeared for me overnight when I followed
the specification.
I looked to the markup for NISO Z39 for guidance and, sure enough,
here is an arbitrary example for section 8.2.163:
<table width="632" rules="groups">
<col width="41.86%"/>
<col width="58.14%"/>
<thead>
<tr>
<th valign="middle" align="center" scope="col">Value</th>
<th valign="middle" align="center" scope="col">Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="left" scope="row"><ext-link
ext-link-type="uri"
xlink:href="http://www.w3.org/1998/Math/MathML";>http://www.w3.org/1998/Math/MathML</ext-link></td>
<td valign="middle" align="left">The prefix
“<monospace>mml</monospace>” has been set to the URL
for the W3C MathML Tag Set.</td>
</tr>
</tbody></table>
... where I see that the rules= is specified without regard for
border= and, per the specification, is considered to be useless.
Has the inclusion of the co-occurrence constraint been added in error?
Thank you for any guidance anyone can offer!
. . . . . . Ken
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