NOVELTY - Degrading insoluble arabinoxylan-containing material, involves admixing the material with a xylanase comprising polypeptide sequence comprising amino acid sequences of SEQ ID NOs: 1 and 2, or SEQ ID NO: 8, variant, fragment, homolog or its derivative or a xylanase which is encoded by a nucleotide sequence of SEQ ID NO: 3, SEQ ID NO: 4 or SEQ ID NO: 5. Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.    USE - The method is useful for degrading insoluble arabinoxylan-containing material, which is useful for preparing plant based product (e.g. corn based product), feed additive, and fermented beverage, preferably beer (all claimed).    DETAILED DESCRIPTION - Method for degrading insoluble arabinoxylan-containing material, involves admixing the material with a xylanase comprising polypeptide sequence comprising amino acid sequences of SEQ ID NOs: 1 and 2, or SEQ ID NO: 8, variant, fragment, homolog or its derivative having at least 80% sequence identity (suitably at least 85%, suitably at least 90%, suitably at least 95% identity) with respect to SEQ ID NO: 1 , SEQ ID NO: 2 or SEQ ID NO: 8, or a xylanase which is encoded by a nucleotide sequence of SEQ ID NO: 3, SEQ ID NO: 4 or SEQ ID NO: 5, or a nucleotide sequence which can hybridize to SEQ ID NO: 3, SEQ ID NO: 4 or SEQ ID NO: 5 under high stringency conditions, or a nucleotide sequence which has at least 80% (suitably at least 85%, suitably at least 90%, suitably at least 93%) identity with respect to SEQ ID NO: 3, SEQ ID NO: 4 or SEQ ID NO: 5, or a xylanase obtainable (or obtained) from Fusarium oxysporum. Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication. INDEPENDENT CLAIMS are included for the following:    (1) plant based product (e.g. corn based product) prepared by the above-mentioned method;    (2) method for preparing feed additive composition; and    (3) fermented beverage, preferably beer produced by the above-mentioned method.