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Clarify that the character set given in section 2.3 for variable, dimension, attribute and group names is a recommendation, not a requirement #526

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Jun 17, 2024
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Clarify that the character set given in section 2.3 for variable, dimension, attribute and group names is a recommendation, not a requirement #526

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2 changes: 1 addition & 1 deletion ch02.adoc
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Expand Up @@ -46,7 +46,7 @@ The examples in this document that use string-valued variables alternate between

=== Naming Conventions

Variable, dimension, attribute and group names should begin with a letter and be composed of letters, digits, and underscores.
It is recommended that variable, dimension, attribute and group names begin with a letter and be composed of letters, digits, and underscores.
By the word _letters_ we mean the standard ASCII letters uppercase `A` to `Z` and lowercase `a` to `z`.
By the word _digits_ we mean the standard ASCII digits `0` to `9`, and similarly _underscores_ means the standard ASCII underscore `_`.
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 (link:$$https://docs.unidata.ucar.edu/nug/current/file_format_specifications.html$$[NUG Appendix B]).
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1 change: 1 addition & 0 deletions history.adoc
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Expand Up @@ -7,6 +7,7 @@

=== Working version (most recent first)

* {issues}237[Issue #237]: Clarify that the character set given in section 2.3 for variable, dimension, attribute and group names is a recommendation, not a requirement.
* {issues}515[Issue #515]: Clarify the recommendation to use the convention of 4.3.3 for parametric vertical coordinates, because the previous wording caused confusion.
* {issues}511[Issue #511]: Appendix B: New element in XML file header to record the "first published date"
* {issues}509[Issue #509]: In exceptional cases allow a standard name to be aliased into two alternatives
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