This paper proposes a non-traditional XML database which supports biometric templates and provides an API which can be used by independent applications in mobile device environments. Until recently biometric systems are becoming more and more visible in mobile phone devices including fingerprint recognition or gait recognition. To gain a real understanding of how it is possible to protect the biometric data, this paper first starts out with introducing a technique for security in a biometric system and emphasizes that template protection is important by going through the vulnerabilities and threats. Furthermore, it points out requirements for template protection, a recital of various template protection schemes and a brief overview of biometric standards.