Electronic Data Interchange- EDI - Formula Sheet
Electronic Data Interchange- EDI - Formula Sheet
While Electronic Data Interchange does not rely on algebraic equations, it utilizes strict syntactical rules, validation constraints, and hierarchical formats that act as structural formulas for automated business document generation.
Hierarchical Structure Formula
The nested levels of a UN/EDIFACT transmission must conform to the following top-down sequence:
| Structural Unit | Envelope Start Code | Envelope End Code | Functional Description |
|---|---|---|---|
| Interchange (Level 1) | UNB | UNZ | The highest grouping level containing transmission headers, sender/receiver IDs, and control counts. |
| Functional Groups (Level 2) | UNG | UNE | Groups similar message types (e.g., invoices) together within a single transmission. |
| Messages (Level 3) | UNH | UNT | An individual business document containing the actual structured transaction data. |
| Segment Groups (Level 4) | N/A | N/A | A repeating set of related segments that group contextually linked fields. |
| Segments (Level 5) | N/A | N/A | A logical row of data containing simple and composite elements separated by delimiters. |
| Composite Elements (Level 6) | N/A | N/A | A collection of linked simple data elements forming a compound field. |
| Simple Data Elements (Level 7) | N/A | N/A | The lowest piece of distinct transactional information (e.g., an individual quantity). |
Syntactical & Transmission Standards
- Message Name Code Length Rule:
Length(Message_Code) = 6(Must be strictly composed of uppercase English alphabetical characters). - Syntax Standard:
ISO 9735(Defines international syntax rules for UN/EDIFACT approved in 1987). - First Standard Year Constraint:
Year(TDCC_Standard) = 1975(First industry-specific format). - Direct Connection Equation:
Links(Point-to-Point) = N * (N - 1) / 2where N is the number of trading partners, representing the total direct channels required without a central hub like VAN.
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