deploy: 08b34f5

Author: willow-ahrens

index.html

@@ -535,7 +535,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">Binary Sparse Format Specification Version 0.1</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#UD">Unofficial Proposal Draft</a>, <time class="dt-updated" datetime="2025-04-28">28 April 2025</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#UD">Unofficial Proposal Draft</a>, <time class="dt-updated" datetime="2026-03-04">4 March 2026</time></p>
    <details open>
     <summary>More details about this document</summary>
     <div data-fill-with="spec-metadata">
@@ -555,7 +555,7 @@ <h1 class="p-name no-ref" id="title">Binary Sparse Format Specification Version
     </div>
    </details>
    <div data-fill-with="warning"></div>
-   <p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2025 <a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>, <a href="https://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document" rel="license">permissive document license</a> rules apply. </p>
+   <p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2026 <a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>, <a href="https://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document" rel="license">permissive document license</a> rules apply. </p>
    <hr title="Separator for header">
   </div>
   <div class="p-summary" data-fill-with="abstract">
@@ -897,7 +897,9 @@ <h5 class="heading settled" data-level="3.5.1.12" id="coo_format"><span class="s
    <p>Coordinate format is an alias for <a href="#coor_format">§ 3.5.1.10 COOR</a> format.</p>
    <h4 class="heading settled" data-level="3.5.2" id="custom_formats"><span class="secno">3.5.2. </span><span class="content">Custom Formats</span><a class="self-link" href="#custom_formats"></a></h4>
    <p>The contents of this section are optional for all parsers, but enable
-customizable sparse formats for matrices and tensors.</p>
+customizable sparse formats for matrices and tensors. If the parser
+does not implement tensor formats, it should error when the "custom" key
+is present.</p>
    <p>Binsparse describes custom multidimensional formats hierarchically.  We can
 understand these formats as arrays of arrays, where the parent array and
 child arrays might use different formats. For example, we could have a dense

spec/latest/index.bs

@@ -289,7 +289,9 @@ Coordinate format is an alias for [[#coor_format]] format.
 ### Custom Formats ### {#custom_formats}
 
 The contents of this section are optional for all parsers, but enable
-customizable sparse formats for matrices and tensors.
+customizable sparse formats for matrices and tensors. If the parser
+does not implement tensor formats, it should error when the "custom" key
+is present.
 
 Binsparse describes custom multidimensional formats hierarchically.  We can
 understand these formats as arrays of arrays, where the parent array and