In some labels in defns, hyphens in a term translate into hyphens in the label:

• [defns.direct-non-list-init]
• [defns.expression-equivalent]

In other labels, they become periods:

• [defns.prog.def.spec]
• [defns.prog.def.type]

Finally we have some cases where the noun is dropped when abbreviating to form the label; in these cases we seem to consistently use a period rather than a hyphen:

• [defns.cond.supp]
• [defns.impl.defined]
• [defns.locale.specific]
• [defns.well.formed]

(That last category might make sense, because English style guides often say to omit the hyphens in compound adjectives when used without a noun, but we don't do that in the standard, eg: "the behavior is implementation-defined" not "the behavior is implementation defined".)

Some consistency here would be nice. Maybe the first two examples above should change from hyphens to periods?