public virtual void startSubstrings(System.String attrName)
{
finalFound = false;
Asn1SequenceOf seq = new Asn1SequenceOf(5);
Asn1Object current = new Asn1Tagged(new Asn1Identifier(Asn1Identifier.CONTEXT, true, SUBSTRINGS), new RfcSubstringFilter(new RfcAttributeDescription(attrName), seq), false);
addObject(current);
SupportClass.StackPush(filterStack, seq);
return ;
}