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@@ -844,17 +844,25 @@ interface mixin Association {
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**Association** represents an internal relation from one node to another.
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An `identifier` field must be present.
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It can match an `identifier` field on another node.
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It can match another node.
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`identifier` is a source value: character escapes and character references are
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*not* parsed.
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Its value must be normalized.
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A `label` field can be present.
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It represents the original value of the normalised `identifier` field.
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Whether the value of `identifier` is expected to be a unique identifier or not
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depends on the type of node including the **Association**.
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An example of this is that `identifier` on [**Definition**][dfn-definition]
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should be a unique identifier, whereas multiple
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[**LinkReference**][dfn-link-reference]s can have the same `identifier` and be
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associated with one definition.
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`label` is a string value: it works just like `title` on a link or a `lang` on
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code: character escapes and character references are parsed.
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To normalize a value, collapse markdown whitespace (`[\t\n\r ]+`) to a space,
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trim the optional initial and/or final space, and perform case-folding.
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Whether the value of `identifier` (or normalized `label` if there is no
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`identifier`) is expected to be a unique identifier or not depends on the type
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of node including the **Association**.
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An example of this is that they should be unique on
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[**Definition**][dfn-definition], whereas multiple
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[**LinkReference**][dfn-link-reference]s can be non-unique to be associated with
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one definition.
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### `Reference`
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