Grammar Structure

Definition: the structure section in a grammar defines the sequence of records in a message.
A structure is required in a grammar except for template grammars.
Example of a simple structure:

structure = [
{ID:'ENV',MIN:1,MAX:999, LEVEL:[        #envelope record
    {ID:'HEA',MIN:1,MAX:9999,LEVEL:[    #header record
        {ID:'LIN',MIN:0,MAX:9999},      #line record
        ]},
    ]}
]

The example above should be read as:

ENV-record is required; max 999 repeats.

'Nested' under the ENV-record: HEA-record; per ENV max 9999 HEA-records; min is 1, so required.

Per HEA-record max 9999 LIN-records; the LIN-record is not required (MIN=0).

Example of a more elaborate structure:

structure = [
{ID:'ENV',MIN:1,MAX:1, LEVEL:[        #envelope record: max one per file
    {ID:'HEA',MIN:1,MAX:9999,LEVEL:[  #header record of messageat least one message per ENV, max 9999 messages
        {ID:'PAR',MIN:2,MAX:10},      #party record
        {ID:'ALC',MIN:0,MAX:9},       #allowances/charges per message
        {ID:'LIN',MIN:0,MAX:9999},    #line record
        ]},
    {ID:'TRL',MIN:1,MAX:1},           #each ENV record has a trailer record
    ]}
]

A structure consists of

1. A structure is a nested list of records.
2. Each record is a python dict.
3. per record:
   • ID: tag of record.
   • MIN: minimum number of occurrences.
   • MAX: maximum number of occurrences.
   • LEVEL (optional): indicate nested record. The nested records are in a list of records.
   • QUERIES (optional)
   • SUBTRANSLATION (optional). Very advanced. Purpose: identify separate messages within within a standard envelope.

QUERIES

QUERIES in a structure are used to extract values from edi files before the mapping script starts.

Example of an structure with QUERIES:

structure = [
{ID:'ENV',MIN:1,MAX:999,                #envelope record
    QUERIES:{
        'frompartner':  {'BOTSID':'ENV','sender':None},   #extract sender from ENV record.
        'topartner':    {'BOTSID':'ENV','receiver':None}, #extract receiver from ENV record.
        'testindicator':({'BOTSID':'ENV'},{'BOTSID':'MESSAGE','test':None}), #extract testindicator from 'deeper' level; note that this is in tuple (with brackets).
        },
    LEVEL:[         
    {ID:'HEA',MIN:1,MAX:9999,LEVEL:[    #header record
        {ID:'LIN',MIN:0,MAX:9999},      #line record
        ]},
    ]}
]

Use cases of the information extracted by QUERIES:
Think of frompartner, topartner, reference, testindicator etc.

1. to choose the right translation (QUERIES can extract frompartner, topartner, alt)

2. Update the database.

3. In a mapping script this information is inn.ta\_info.

4. data in the envelope can be accessed in the mapping.

5. One of the most import uses is the extraction of botskey.

6. Typical information extracted by QUERIES:

   • frompartner
   • topartner
   • reference
   • testindicator
   • botskey
   • alt