Hi,
Can someone help me in resolving below issue or give some pointers
to documentation.
Thank you,
Chandra
> -----Original Message-----
> From: Konduru, Chandra
> Sent: Thursday, June 21, 2001 5:28 PM
> To: '[EMAIL PROTECTED]'
> Subject: Question on nested CHOICE types
>
> Hi,
>
> I have the following definition:
>
> MY_DEF DEFINITIONS IMPLICIT TAGS ::=
>
> BEGIN
>
> SGSN_PDP_RECORD ::= SET
> {
> ...
> servedPdpAddr [10] PDP_Address
> ...
> }
>
> PDP_Address ::= CHOICE
> {
> ipAddr [0] IP_Addr,
> etsiAddr [1] OCTET STRING (SIZE(1..20))
> }
>
> IP_Addr ::= CHOICE
> {
> -
> - No context-specific tags for IP_Addr
> -
> ipBinAddr IP_Bin_Addr,
> ipTxtAddr Ip_Txt_Addr
> }
>
> IP_Bin_addr ::= CHOICE
> {
> ipBinV4Addr [0] OCTET STRING,
> ipBinV6Addr [1] OCTET STRING
> }
>
> IP_Txt_addr ::= CHOICE
> {
> ipTxtV4Addr [2] OCTET STRING,
> ipTxtV6Addr [3] OCTET STRING
> }
>
> END
>
> Here MY_DEF is using global IMPLICIT tags.
> My question is while encoding the PDP_Address (which has
> ipAddr->ipBinAddr->ipBinV4), what tag I should use to encode
> ipAddr. We don't have universal tag for CHOICE. But can we
> have context specific tag for the CHOICE?
> And if any context specific tag is present for CHOICE,
> do we need to encode the tag for CHOICE?
>
> pdpAddr(implicit tag 10)
> ipAddr(implicit tag 0)
> ipBinAddr(no tag)
> ipBinV4Addr(implicit tag0)
>
> Is the above tagging correct for encoding pdpAddr?
>
> Any help is appreciated.
> If possible, can you please give elaborate explanation for the above
> example or in general.
>
> -Chandra
