what can be the content type (part of Content info ) other than simple data in Signed data

[Konark]

what can be the content type (part of Content info ) other than simple data in Signed data.     Structure description ................     SignedData ::= SEQUENCE {   version Version,     digestAlgorithms DigestAlgorithmIdentifiers,   contentInfo ContentInfo,   certificates       [0] IMPLICIT ExtendedCertificatesAndCertificates        OPTIONAL,   crls     [1] IMPLICIT CertificateRevocationLists OPTIONAL, signerInfos SignerInfos }   ContentInfo ::= SEQUENCE {   contentType ContentType,   content     [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL } ->It seems to be content type can only be Simple data ( after looking in to the code ) -> Is it possible to put content type other than simple data like enveloped data when authenticated attributes are present .       Regards, konark