| Segment | Ebene | Beschreibung | Opt/Mand. |
|---|
| UNH | 0 | A service segment starting and uniquely identifying a message. The message type code for the Directory definition message is DIRDEF. Note: Directory definition messages conforming to this document must contain the following data in segment UNH, composite S009: Data element 0065 DIRDEF D A UN | Mandatory |
| BGM | 0 | A segment to indicate the beginning of the message and to transmit function, type and number of the message. | Mandatory |
| DII | 0 | A segment specifying the identity of the directory set and giving its language and maintenance operation. | Mandatory |
| DTM | 0 | A segment specifying dates related to the directory set, such as date of approval, date of submission or WP.4 acceptance date. | Optional |
| FTX | 0 | A segment providing free text information related to the directory set. | Optional |
| SG1 | 0 | SG1 | Optional |
| NAD | 1 | A segment identifying the parties involved in the transaction, e.g. originator, requestor or secretariat. | Mandatory |
| SG2 | 1 | SG2 | Mandatory |
| CTA | 2 | A segment identifying a person or a department for the party specified in the leading NAD segment to whom the communication should be directed. | Mandatory |
| COM | 2 | A segment identifying communication type(s) and number(s) of person(s) or department(s) specified in the associated CTA segment. | Optional |
| SG3 | 0 | SG3 | Optional |
| MSG | 1 | A segment identifying a message type to be specified. | Mandatory |
| ATT | 1 | A segment used to specify an attribute related to a message type. It may indicate whether the message is a batch or an interactive message, or may indicate the specific type of maintenance applied to the message in the current release of the message type directory. | Optional |
| FTX | 1 | A segment providing textual information related to the message type, namely: message type name, Introduction, Scope, Functional definition, Principles, References and Terms and definitions. | Optional |
| DTM | 1 | This segment is used to indicate the release date of a message, as indicated on the cover page of the boilerplate. | Mandatory |
| SG4 | 1 | SG4 | Mandatory |
| SGU | 2 | A segment specifying the usage of a segment in a message type structure. | Mandatory |
| ATT | 2 | A segment used to specify an attribute related to the usage of a segment in a message type structure. It may indicate the specific type of maintenance applied to the segment within the message structure in the current release of the message type directory. | Optional |
| FTX | 2 | A segment providing textual information about segment usage. This information comprises part of the 'Data segment clarification' section. | Optional |
| SG5 | 2 | SG5 | Optional |
| GRU | 3 | A segment specifying the usage of a segment group in a message type structure. | Mandatory |
| ATT | 3 | A segment used to specify an attribute related to the usage of a segment group in a message type structure. It may indicate the specific type of maintenance applied to the segment group within the message structure in the current release of the message type directory. | Optional |
| FTX | 3 | A segment providing the textual information about segment group usage. This information comprises part of the 'Data Segment Clarification' section. | Optional |
| SG6 | 1 | SG6 | Optional |
| FNT | 2 | A segment to provide the footnote identification for a dependency note or other note that is applicable to one or more segments and/or segment groups in the message type structure. | Mandatory |
| REL | 2 | A segment to provide the type of dependency relationship, where one exists. | Optional |
| GIR | 2 | A segment to provide the position number(s) for segments and/or segment groups to which a dependency note or other note applies. | Optional |
| ATT | 2 | A segment to provide the change indicators at the note level. | Optional |
| FTX | 2 | A segment to provide a free text description of the dependency note or other note. | Optional |
| SG7 | 0 | SG7 | Optional |
| SEG | 1 | A segment identifying a segment type and specifying its class and maintenance operation. | Mandatory |
| ATT | 1 | A segment used to specify an attribute related to a segment type. It may indicate whether the segment is a batch or an interactive segment, or may indicate the specific type of maintenance applied to the segment in the current release of the segment directory. | Optional |
| FTX | 1 | A segment specifying the name and functional definition of a segment type. | Optional |
| ELU | 1 | A segment specifying the contents of data elements in a segment type. | Optional |
| SG8 | 1 | SG8 | Optional |
| FNT | 2 | A segment to provide the footnote identification for a dependency note or other note that is applicable to one or more data elements in a segment type. | Mandatory |
| REL | 2 | A segment to provide the type of dependency relationship, where one exists. | Optional |
| GIR | 2 | A segment to provide the position number(s) for a data element to which a dependency note or other note applies. | Optional |
| ATT | 2 | A segment to provide the change indicators at the note level. | Optional |
| FTX | 2 | A segment to provide a free text description of the dependency note or other note. | Optional |
| SG9 | 0 | SG9 | Optional |
| CMP | 1 | A segment identifying a composite data element and specifying its class and maintenance operation. | Mandatory |
| ATT | 1 | A segment used to specify an attribute related to a composite data element type. It may indicate whether the composite data element is a batch or an interactive composite data element, or may indicate the specific type of maintenance applied to the composite data element in the current release of the composite data element directory. | Optional |
| FTX | 1 | A segment specifying the name and functional definition of a composite data element type. | Optional |
| ELU | 1 | A segment specifying component data elements in a composite data element and its related information. | Optional |
| SG10 | 1 | SG10 | Optional |
| FNT | 2 | A segment to provide the footnote identification for a dependency note or other note that is applicable to one or more component data elements in a composite data element type. | Mandatory |
| REL | 2 | A segment to provide the type of dependency relationship, where one exists. | Optional |
| GIR | 2 | A segment to provide the position number(s) for a data element to which a dependency note or other note applies. | Optional |
| ATT | 2 | A segment to provide the change indicators at the note level. | Optional |
| FTX | 2 | A segment to provide a free text description of the dependency note or other note. | Optional |
| SG11 | 0 | SG11 | Optional |
| ELM | 1 | A segment identifying a simple data element and giving related information. | Mandatory |
| ATT | 1 | A segment used to specify an attribute related to a simple data element type. It may indicate whether the data element is a batch, or an interactive, or both a batch and an interactive simple data element. It may indicate the specific type of maintenance applied to the data element in the current release of the simple data element directory. | Optional |
| FTX | 1 | A segment specifying the name and functional definition of a simple data element. | Optional |
| SG12 | 0 | SG12 | Optional |
| CDS | 1 | A segment specifying a code set. In DIRDEF data element 9434 shall not be used. | Mandatory |
| FTX | 1 | A segment providing textual information related to the code list. | Optional |
| SG13 | 1 | SG13 | Optional |
| CDV | 2 | A segment specifying a code value. | Mandatory |
| ATT | 2 | A segment used to specify an attribute related to a code value. It may indicate the specific type of maintenance applied to the code value in the current release of the code list directory. | Optional |
| FTX | 2 | A segment specifying the name and functional definition of a code value. | Optional |
| UNT | 0 | A service segment ending a message, giving the total number of segments in the message (including the UNH & UNT) and the control reference number of the message. | Mandatory |
