expression about the position of knowledge of judge and documents in civil procedure based on article 1335 of civil code

in different codes, document is recognized as a valid evidence, but in article 1335 of the civil code it is used as an expression that denies its validity as an independent evidence and limits its documentary effect as introduction of knowledge of judge; so the expression of the legislator in this article about the document is inconsistent with other articles of that code as well as with articles of other codes in this case and casts doubt on the validity of the document. the current research aims to analyze this question and offer some ways for solution of this inconsistency proving that the validity of document as an independent evidence is still undeniable.