The ASN1C compiler contains the capability of generating corresponding XML Schema type definitions from ASN.1 types. This capability is also present in a free online tool (ASN2XSD) that may be accessed via the following URL:

http://www.obj-sys.com/asn2xsd.php

ASN.1 types are converted to XML Schema and ASN.1 values are converted to XML. ASN.1 value sets, which are essentially a set of constraints, get converted to facets in XML Schema.