| _FixIE | An information element in a fixbuf template |
| _FixIEKey | An information element identifier |
| _FixIERegistry | An information element registry |
| _FixTemplate | A fixbuf template |
| _FixTemplateCtx | A template context; analogous to an IPFIX session |
| _FixTemplateSpec | A template field specifier for use in programatically defining templates |
| _FixVarfield | A variable-length field value |