# Schemata and principles

Japanese version

Schemata and principles are defined in the file "grammar/schema.lil"．The name of each schema is given in the file "grammar/types.lil"．

The following standard HPSG schemata are implemented．

Schema | Name given to the schema in the definition file | Description
--- | --- | ---
Head-Subject Schema | subj_head_schema | A verb takes a noun phrase as its subject
Head-Complement Schema | head_comp_schema | A verb or a preposition takes a noun phrase as its object
Head-Specifier Schema | spec_head_schema | A noun takes a determiner(an article or a demonstrative)
Head-Modifier Schema (left head) | head_mod_schema | The head is premodified by a modifier
Head-Modifier Schema (right head) | mod_head_schema | The head is postmodified by a modifier
Head-Filler Schema | filler_head_schema | Long distance dependencies

Besides the above schemata, we have added the following schemata．

Name given to the schema in the definition file | Description
--- | ---
head_relative_schema | A noun is modified by a relative clause
coord_right_schema | A conjunction takes its right conjunct as its argument
coord_left_schema | A conjunction takes its left conjunct as its arugment
empty_filler_head_schema | A relative clause takes an empty relative pronoun as its argument
empty_specifier_schema | ?A noun takes an empty specifier as its argument

The following principles are implemented．

Name given to the schema in the definition file | Description
--- | ---
head_feature_principle | The HEAD value of the head daughter is passed up to its mother
semantic_binary_principle | ?The CONT value of the head daughter is passed up to its mother. The CONT value of the non-head daughter is incorporated in the RELS list of its mother.非主辞の CONT は RELS に入る
semantic_unary_principle | The CONT value of the only daughter is passed up to its mother.
phonology_principle | The PHON value of all daughters are concatenated
adjacency_principle | The PROB_FEATURE|L_ADJAC feature contains information passed up from the left daughter whereas of PROP_FEATURE|R_ADJAC contains information passed up from the right daughter

Besides the able principles, we have principles for passing information used by the statistical model．

Other principles in HPSG(such as the Valence Principle) are hard-coded as part of the above principles.

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