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Sometimes "node" and "nodes" are represented as links to their definitions, but sometimes they aren't. e.g. 4 Phases of Serialization, Markup Generation "document node" not linked, but a paragraph later in Character expansion, "attribute and text nodes" is linked.
Looking at XP31, node is only linked to the definition on first use, and not after. I have kept the links in 1.1 Terminology and removed all the others to be consistent with this.