private IetfAttrSyntax(ASN1Sequence seq)
    {
        int i = 0;

        if (seq.getObjectAt(0) instanceof ASN1TaggedObject)
        {
            policyAuthority = GeneralNames.getInstance(((ASN1TaggedObject)seq.getObjectAt(0)), false);
            i++;
        }
        else if (seq.size() == 2)
        { // VOMS fix
            policyAuthority = GeneralNames.getInstance(seq.getObjectAt(0));
            i++;
        }

        if (!(seq.getObjectAt(i) instanceof ASN1Sequence))
        {
            throw new IllegalArgumentException("Non-IetfAttrSyntax encoding");
        }

        seq = (ASN1Sequence)seq.getObjectAt(i);

        for (Enumeration e = seq.getObjects(); e.hasMoreElements();)
        {
            ASN1Primitive obj = (ASN1Primitive)e.nextElement();
            int type;

            if (obj instanceof ASN1ObjectIdentifier)
            {
                type = VALUE_OID;
            }
            else if (obj instanceof DERUTF8String)
            {
                type = VALUE_UTF8;
            }
            else if (obj instanceof DEROctetString)
            {
                type = VALUE_OCTETS;
            }
            else
            {
                throw new IllegalArgumentException("Bad value type encoding IetfAttrSyntax");
            }

            if (valueChoice < 0)
            {
                valueChoice = type;
            }

            if (type != valueChoice)
            {
                throw new IllegalArgumentException("Mix of value types in IetfAttrSyntax");
            }

            values.addElement(obj);
        }
    }