Code Components which may be found in IETF Contributions and IETF Documents:

o ABNF definitions
o ASN.1 modules
o ASN.1 structures
o Management Information Base (MIB) modules
o TLS presentation syntax
o eXternal Data Representation (XDR)
o Extensible Markup Language (XML) Schemas
o XML DTDs
o XML RelaxNG definitions
o tables of values
o classical programming code
o Policy Information Base (PIB) module
o YANG modeling language