E-HowNet Grammar

Text

TEXT

[A-Za-z0-9\x80-\U0010FFFF|+\-.]+

NUMBER

e.g. 1, 0.1, 1e-4

COINDEX

x[0-9]*

Node

Entity

ehn.node.EhnNormalEntity

• {TEXT}
• {TEXT:FEATURE}
• {TEXT:FEATURE,FEATURE}
• {TEXT:FEATURE,FEATURE,...}
• {TEXT_COINDEX:FEATURE}
• {TEXT_COINDEX:FEATURE,FEATURE}
• {TEXT_COINDEX:FEATURE,FEATURE,...}

ehn.node.EhnFunctionEntity

• {FUNCTION}
• {FUNCTION:FEATURE}
• {FUNCTION:FEATURE,FEATURE}
• {FUNCTION:FEATURE,FEATURE,...}
• {FUNCTION_COINDEX:FEATURE}
• {FUNCTION_COINDEX:FEATURE,FEATURE}
• {FUNCTION_COINDEX:FEATURE,FEATURE,...}

ehn.node.EhnAnyEntity

{}

ehn.node.EhnTildeEntity

{~} (deprecated)

ehn.node.EhnNameEntity

{"TEXT"}

ehn.node.EhnNumberEntity

{NUMBER}

ehn.node.EhnCoindexEntity

{COINDEX}

Feature

ehn.node.EhnNormalFeature

• TEXT=ENTITY
• TEXT=RESTRICTION

ehn.node.EhnFunctionFeature

• FUNCTION=ENTITY
• FUNCTION=RESTRICTION

Function

ehn.node.EhnFunction

• TEXT()
• TEXT(RESTRICTION)
• TEXT(ENTITY)
• TEXT(ENTITY,ENTITY)
• TEXT(ENTITY,ENTITY,...)

Restriction

ehn.node.EhnRestriction

• /ENTITY
• /ENTITY_COINDEX

Valid Expression

ENTITY or any number of FEATUREs joined by ,s.

Examples

• ENTITY
• FEATURE
• FEATURE,FEATURE
• FEATURE,FEATURE,FEATURE