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cf-conventions.html

@@ -471,7 +471,7 @@ <h1>NetCDF Climate and Forecast (CF) Metadata Conventions</h1>
 <span id="author30" class="author">Christopher&#160;Barker</span><br>
 <span id="author31" class="author">Sadie&#160;Bartholomew</span><br>
 <span id="revnumber">version &#160;1.12 draft,</span>
-<span id="revdate">&#160;&#160;23&#160;February,&#160;2024&#160;15:24:55Z</span>
+<span id="revdate">&#160;&#160;01&#160;March,&#160;2024&#160;17:10:07Z</span>
 <br><span id="revremark">See&#160;<a href="https://cfconventions.org" target="_blank">https://cfconventions.org</a>&#160;for&#160;further&#160;information.</span>
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@@ -1443,7 +1443,8 @@ <h3 id="_naming_conventions"><a class="anchor" href="#_naming_conventions"></a>2
 By the word <em>letters</em> we mean the standard ASCII letters uppercase <code>A</code> to <code>Z</code> and lowercase <code>a</code> to <code>z</code>.
 By the word <em>digits</em> we mean the standard ASCII digits <code>0</code> to <code>9</code>, and similarly <em>underscores</em> means the standard ASCII underscore <code>_</code>.
 Note that this is in conformance with the COARDS conventions, but is more restrictive than the netCDF interface which allows almost all Unicode characters encoded as multibyte UTF-8 characters (<a href="https://docs.unidata.ucar.edu/nug/current/file_format_specifications.html">NUG Appendix B</a>).
-The netCDF interface also allows leading underscores in names, but the NUG states that this is reserved for system use.</p>
+The netCDF interface also allows leading underscores in names, but the NUG states that this is reserved for system use.
+ASCII period (.) and ASCII hyphen (-) are also allowed in attribute names only.</p>
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 <div class="paragraph">
 <p>Case is significant in netCDF names, but it is recommended that names should not be distinguished purely by case, i.e., if case is disregarded, no two names should be the same.
@@ -12200,6 +12201,9 @@ <h3 id="_working_version_most_recent_first"><a class="anchor" href="#_working_ve
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+<p><a href="https://github.com/cf-convention/cf-conventions/issues/477">Issue #477</a>: Period and hyphen allowed in attribute names</p>
+</li>
+<li>
 <p><a href="https://github.com/cf-convention/cf-conventions/issues/500">Issue #500</a>: Appendix B: Added a <strong><code>conventions</code></strong> string to the standard name xml file format definition</p>
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@@ -12828,7 +12832,7 @@ <h3 id="_references"><a class="anchor" href="#_references"></a>References</h3>
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 Version &#160;1.12 draft<br>
-Last updated 2024-02-23 15:24:55 UTC
+Last updated 2024-03-01 17:10:06 UTC
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conformance.html

@@ -500,6 +500,9 @@ <h3 id="naming-conventions">2.3 Naming Conventions</h3>
 <p>Variable, dimension and attribute names should begin with a letter and be composed of letters (A-Z, a-z), digits (0-9), and underscores(_). This corresponds to ASCII characters in the decimal ranges (65-90), (97-122), (48-57), and (95). The corresponding Unicode codepoints are (U+0041-U+005A), (U+0061-U+007A), (U+0030-U+0039), and (U+005F).</p>
 </li>
 <li>
+<p>ASCII period (.) and ASCII hyphen (-) may also be included in attribute names only.</p>
+</li>
+<li>
 <p>No two variable names should be identical when case is ignored.</p>
 </li>
 </ul>
@@ -1518,7 +1521,7 @@ <h3 id="parametric-vertical-coordinates">Appendix D Parametric Vertical Coordina
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-Last updated 2024-02-23 15:24:53 UTC
+Last updated 2024-03-01 17:10:08 UTC
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