...Vorfeld.

As always, there are some exceptions to this rule: Relative clauses, which may appear on their own in the Nachfeld, do not (on their own) occur in the Vorfeld. To take another example, pronouns do not occur in the Nachfeld.

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...possibilities.

There are, of course, abbreviatory devices in any implementation of LFG which allow a more concise presentation of the rules, but which to my knowledge have no theoretical status in LFG.

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...domains.

Note that in this case we have not a single rooted tree, but rather an ordered sequence of trees (by virtue of ordering d₁, d₂, and d₃) as domain structure. In general, we assume the sentence period to govern the finite verb and to introduce a single domain for the complete sentence.

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...resp.:

For details of the notation, please refer to [Bröker1998].

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...ones.

Note that each phrasal level in PS-based trees defines a scope for linear precedence rules, which only apply to sister nodes.

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