# Packages
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# Functions
NewAccount is constructor.
NewAccountWithPlainPassword is constructor.
NewAuthority is constructor.
NewBook is constructor.
NewCategory is constructor.
NewFormat is constructor.
NewPage is constructor.
# Structs
Account defines struct of account data.
Authority defines struct of authority data.
Book defines struct of book data.
Category defines struct of category data.
Format defines struct of format data.
Page defines struct of pagination data.
RecordAccount defines struct represents the record of the database.
RecordBook defines struct represents the record of the database.
# Interfaces
DomainObject defines the common interface for domain models.