Using an example from Johnson, if the call constructs a binary parse tree node with the specified and children, then the rule
42.
Parse trees concretely reflect the syntax of the input language, making them distinct from the abstract syntax trees used in computer programming.
43.
This parse tree lacks the phrasal categories ( S, VP, and NP ) seen in the constituency-based counterpart above.
44.
However an optimal structure is the one where there is one and only one correspondence between the parse tree and the secondary structure.
45.
Different but equivalent phrase grammars yield different parse trees, though the underlying language ( set of valid documents ) is the same.
46.
As an example, a sample instance might be a natural language sentence, and the output label is an annotated parse tree.
47.
This obscures the CYK algorithm decision on finding an optimal structure as the correspondence between the parse tree and the structure is not unique.
48.
More often, however, a node in a parse tree is a static symbol such as a number, letter, or word.
49.
It creates a parse tree for parsed pages that can be used to extract data from HTML, which is useful for web scraping.
50.
More elaborate, unambiguous and context-free grammars can be constructed that produce parse trees that obey all desired operator precedence and associativity rules.
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