[ASN.1] Abount definite and indefinite lenght encoding

[Pino Roberto]

Hi,
I would like to know if it's possible with ASN.1, use different lenght
encodings for structure in the same file.
For example, is possible encoding a structure with indefinite lenght
encoding and another (may be a substructure of the first one) with definite
lenght encoding?
And if it's possibile, how can the encoder recognize structures to be
encoded with definite lenght encoding from structures with indefinite lenght
encoding? Is there any ASN.1 tag to use?
Thanks, bye, Roberto