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A related structure is a certificate request, defined in PKCS#10 from RSA Security, Inc, also reflected in RFC2896. In OpenSSL, the type X509_REQ is used to express such a certificate request.
To handle some complex parts of a certificate, there are the types X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express a certificate attributes), X509_EXTENSION (to express a certificate extension) and a few more.
Finally, there's the supertype X509_INFO, which can contain a CRL, a certificate and a corresponding private key.
XX550099___._._., dd22ii__XX550099___._._. and ii22dd__XX550099___._._. handle X.509 certificates, with some exceptions, shown below.
XX550099__CCRRLL___._._., dd22ii__XX550099__CCRRLL___._._. and ii22dd__XX550099__CCRRLL___._._. handle X.509 CRLs.
XX550099__RREEQQ___._._., dd22ii__XX550099__RREEQQ___._._. and ii22dd__XX550099__RREEQQ___._._. handle PKCS#10 certificate requests.
XX550099__NNAAMMEE___._._. handle certificate names.
XX550099__AATTTTRRIIBBUUTTEE___._._. handle certificate attributes.
XX550099__EEXXTTEENNSSIIOONN___._._. handle certificate extensions.