gistfile1.aw

<?php

use Symfony\Component\Validator\Constraints as Assert

class ObjectRecievingMultiplieFilesFromForm
{
    /** 
     * @Assert\All({
     *      @Assert\File(mimeTypes={"application/vnd.ms-excel", "application/vnd.ms-office"})
     * })
     * @Assert\Collection(fields={0 = @Assert\NotNull}, allowExtraFields=true)
     */
    public $files;
}