Prolog Parser Implementation

Hi I am trying to implement a parser for a simple language with grammar like this.

program ::= "program" declarations "begin" statements "end"

declaration ::= "var" ident "as" type

type ::= "string" | "int"

I have the first two done, how would I write the type grammar?

program( prog( DECLS, STATS ) ) --> [ 'program' ], declarations( DECLS ), [ 'begin' ], statements( STATS ), [ 'end' ].

declaration( decl( IDENT, TYPE ) ) --> [ 'var' ], ident( IDENT ), [ 'as' ], type( TYPE ).

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