As per the VIS rules, from 12 October 2015, all applicants applying for a Schengen visa must come to Austria visa application center/embassy/consulate submit biometric data for ten fingerprints and a photo. In the following 59 months, the applicant can leave the application without visiting the Visa Application Center.
In case it is a child under the age of 12 for Short Stay Visa, a child under the age of 6 for a Long Stay Visa or if it is physically impossible, she/he need not come for submission in person.
If you want to submit your application through an agent/representative, he/she needs to present his/her own ID and an authorization letter issued by the applicant. If you have never been to the Schengen area, your visa application must be submitted in person.