# Labeled bracketing

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**Labeled bracketing** is a way of representing the structure of an expression by writing square brackets ('[' and ']') to the left and right hand side of its component parts, i.e. words or constituents. The brackets carry subscripts, so-called labels, which state the category of the unit in question.

### Example

the structure of the sentence *the boy may eat apples* is written as in (i):

(i) [_{IP}[_{NP}[_{Det}the][_{N}boy]][_{I'}[_{I}may][_{VP}[_{V}eat][_{NP}[_{N}apples]]]]]

The bracket notation is equivalent to the representation by means of a tree structure. The labeled brackets correspond to the nodes in the tree. Thus, a labeled bracketing like (ii) is equivalent to the tree in (iii).

(ii) [_{NP}[_{Det}the] [_{N}boy]] (iii) NP / \ Det N / \ the boy