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docs(language): only a dimension some declaration reaches needs a source #378

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FBumann merged 1 commit into from
Sep 2, 2026
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docs(language): only a dimension some declaration reaches needs a source #378

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6 changes: 4 additions & 2 deletions docs/reference/language/dimensions.md
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Expand Up @@ -46,8 +46,10 @@ consumer implements them rather than choosing them.
**The dimension's own source supplies its members.** They are read from the key
named after the dimension, and from nothing else: a parameter's table is read
for values, never for labels, and a lookup's map is not a claim about which
members exist. A dimension nothing supplies is an error naming it, not an empty
axis — an axis with no members would delete every row indexed by it, silently.
members exist. A dimension a declaration reaches and nothing supplies is an
error naming it, not an empty axis — an axis with no members would delete every
row indexed by it, silently. A declared dimension no declaration reaches asks
nothing of the data, and needs no source.

**Their order is the order that source gives them**, first row first. It is not
sorted, and nothing about a label's type changes that: an axis of strings, of
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