In ST, mark certain items as Optional, with special appearance

Description

For example, alt=... are optional, as are -2, +2 relative days.

This should be much clearer to users. We should also make sure to show the sideways inheritance for alts.

Also the compound language names (en_US). We also need to make sure people understand that these don't count as Missing (and double-check that).

Maybe build a test for isOptional into PathHeader? Or someplace else?

xpath

None

locale

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Priority

major

Assignee

Thomas Bishop

Reporter

Mark Davis

Reviewer

None

Labels

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Fix versions

phase

dvet
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