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https://issues.apache.org/jira/browse/DAFFODIL-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17578005#comment-17578005
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Mike Beckerle commented on DAFFODIL-2720:
-----------------------------------------
Note that spaces or tabs means exactly U+0009 and U+0020 only, not other
Unicode space-like characters such as U+00A0 (No Break Space).
> New Char Class Entities: LSP LSP* LSP+ SP* SP+
> ----------------------------------------------
>
> Key: DAFFODIL-2720
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2720
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End, Front End
> Affects Versions: 3.3.0
> Reporter: Mike Beckerle
> Priority: Major
>
> [DFDL wish list
> |https://cwiki.apache.org/confluence/display/DAFFODIL/DFDL+Wish+List]for DFDL
> future versions (DFDL v2), suggests the need for the LSP (within a line only)
> character class entity, and more recently we've encountered the need for SP*
> and SP+ as well.
> The LSP entity has 3 flavors: %LSP; %LSP*; and %LSP+; The "L" denotes
> within-a-line whitespaces, no line-ending characters, so really just space
> and tab.
> The LSP matches exactly 1 such character, the LSP* matches zero or more, the
> LSP+ matches one or more.
> On unparsing, the LSP and LSP+ output exactly 1 space. The LSP* outputs
> nothing.
> The SP entity has 3 flavors also, but %SP; is already existing. %SP*; and
> %SP+; need to be created. These match zero or more, and one or more spaces
> (only) respectively. On unparsing SP* outputs nothing, SP+ outputs a single
> space.
> This ticket is for implementing this new proposed/experimental feature for
> DFDL, which can be proposed for DFDL v2.0 inclusion
> A dfdlx property must be used to enable this feature. Without setting this
> property, the feature should be disallowed. (The diagnostic message should
> clearly state how to enable it however. Rather than just saying it's not
> allowed.)
> This feature requires a documentation page (wiki) also.
>
>
>
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