In previous blog posts I discussed ‘AODB and Big Data‘ and ‘AODB in the Cloud‘. As promised, in this third and largest part of the review, I will look at the NoSQL database approach, design a document datamodel, embed it into a MEAN stack and conclude in looking forward implementing an AODB in a Serverless Architecture using Microservices.
In this new series I will review the benefits and options of using a document-oriented database (NoSQL) and start a transition journey moving away from a relational database model to document database.
Before jumping into relational datamodel review and document design we shall have look at some industry initiatives and working groups that strive for standards with semantic models, business models, information and data models and exchange formats and patterns. While a lot of airport systems have been developed years back in the absence of these models, but with best knowledge and common practice and experience in the field, we cannot ignore further the existence of emerging and established standards. For legacy systems is near to impossible to adopt the models at the core business implementation layer as products are usually designed around a datamodel which cannot be changed without a significant or even total redesign of the system. Here the approach is the adoption of the models at an integration and mapping layer. You can adopt eg. AIDX as messaging exchange format without having to use it as base of the product, though it creates additionally effort to create mappings. An additional challenge is certainly the number of models around because they were created by different organisations with different but often overlapping aviation domains in mind. I have to admit the organisations are cooperating and represented in the working groups to achieve a level of harmonization where possible. We look at IATA, ICAO, ACI, Eurocontrol, EUROCAE as lead organizations here.
Lets list the current models. This list is certainly not complete and only provides a brief overview. We can and should benefit from the availability of these models (most of them are freely accessible). A lot of standardization effort is going on at the moment, please note some models are to be considered as “work-in-progress”, some are quite advanced, major changes are not be expected and some are also due to submission to governing boards soon or in the process of it. Once the models, at least the exchange message formats, start materializing as official standard we will see them appearing in requirement and tender documents and soon to be out there to simplify system integration.
|AIDX||Aviation Information Data Exchange||IATA||XML Message Standard||***|
|AIDM||Airline Industry Data Model||IATA||Model||**|
|AIRM||ATM Information Reference Model||Eurocontrol||Model||***|
|AIXM||Aeronautical Information Exchange Model||Eurocontrol||Model||***|
|ACRIS Semantic Model||ACI||Model||*|
|AMXM||Aerodrome Mapping Exchange Model||EUROCAE||Model||***|
|FIXM||Flight Information Exchange Model||Model||***|
|WXXM||Weather Information Exchange Model||Eurocontrol||Model||***|
||Baggage Message Exchange||Eurocontrol||XML Message Standard||*|
Status as of end 2016
*** official release available
* work in progress
In the context of AODB products I will look at the below models and message standards first, though all of them are important because there is no clear borderline in the heterogeneous IT landscape at airports, eg. it is a common request by users to see weather data being displayed in dashboards of an AODB despite weather is not a key entity. In the further blog entries, while establishing a new datamodel, we will also discuss the individual models. Some models focus more on ATM and less on airport related activities.
Aviation Information Data Exchange is a XML messaging standard to allow information exchange between airlines, airports and other parties in the aviation community. It has been initially created in 2005 and was officially released in 2008, endorsed by IATA Recommended Practice 1797A. Being one of the old timer in this list it is already established and adopted by more than 100 entities. It comprises almost 100 distinct fields that cover most aspects of flight, aircraft and handling details, inclusive of A-CDM. The AIDX working group is governed by ASC (Airport Services Committee) and PADIS (Passenger and Airport Data Interchange Standards) board under the custody of PSC (Passenger Service Conference).
Please note that AIDX will be migrated into the AIDM (Airline Industry Data Model) which has a much broader scope than AIDX. We shall not ignore AIDX as it will be around for a long time in its raw format and we can expect the AIDM implementation would be quite close (to be discussed and confirmed).
The current release is 16.1. Please follow below links for schema and implementation guide.
AIDM and BAG XML
The Airline Industry Data Model (AIDM) has a very broad scope and encompass industry terminology, data definitions, relationships, business requirements.
Looking at an evolution from paper (eg. loadsheets ticket), teletype messages to EDIFACT, the emerging new standards as models and XML are the latest step in the evolution and promise to deliver a better consistency of definitions and data formats, as well an improved interoperability and faster system integration times.
AIDM is work-in-progress and give its nature and vast landscape it might be the continuous model for it, though confirmed standards will arise from it. One of the first implementations adopting the AIDM is the BAG XML initiative which improves bag handling related bag messaging, distribution and does away with the traditional type B messages (BTM, BSM, BPM, BUM, BNS, BCM, BMM, BRQ as per IATA RP 1745).
The documents are not public at this stage, only registered member can access the model which is build with Sparx Enterprise Architect.
In part 2 I will review a simplified relational database model for an AODB as starting point for our migration journey. Stay tuned.
Some reference websites and material you find below.
|ACI||Airports Council International||http://www.aci.aero|
|IATA||International Air Transport Association||http://www.iata.org|
|ICAO||International Civil Aviation Organization||http://www.icao.int|
|EUROCAE||European Organisation for Civil Aviation Equipment||https://www.eurocae.net|
|RTCA||Radio Technical Commission for Aeronautics||http://www.rtca.org|
References Standardization and models
(✓ Model, implementation guidelines or schema available on website without registration.)
Disclaimer: This discussion, datamodel and application is for study purpose solely. It does not reflect or replicate any existing commercial product.