June 3, 2019 posted by

The rest of the semantics for modeling architectural structure are basically the same as those for modeling instances. In HTML, however, there is a finite set of allowed tags, each of which has a specific meaning dedicated to screen layout. Case Studies What is a Case Study? Because types are seen as independent entities, not necessarily bound to a single architecture or level of the hierarchy, they are grouped up in this fashion. A case study analysis requires you to investigate a business problem, examine the alternative solutions, and propose the most effective solution using supporting

The answer to this problem is to introduce a meta-language , a language for defining languages. All Rights Reserved Worldwide. Elements may be nested as necessary, but may not overlap. The signatures in the component type T prescribe what types of interfaces must exist on a component of type T for that component to properly be “of that type. Thus, the two components each have interfaces of types TopType and BottomType.

To date, xADL includes constructs that permit modeling of: For example, this is a real component description in xADL: Due to the large semantic differences among these architectures, this vision never became a reality.

xadl case study

How do two parties sharing marked-up documents come to an cadl on what elements are allowed, and where? The obvious disadvantage is that this additional validity constraint must be verified by external tools, and cannot be verified solely by XML tools or by the structure of the language itself.

Thus, two components or connectors who share a type will also have the same internal architecture if any. Case study elements and descriptors [31] A final, critical point when conducting case study research is the importance of careful preparation and planning The cases profiled range in size and scope, and At this point, it is possible to look at how the example in the above example would be specified in xADL using pseudo-XML notation: Interfaces for the inner architecture have been added in this diagram other signatures, interfaces still omitted for clarity.


Notionally, in a boxes-and-arrows sense, the relationships between components, connectors, interfaces, and links can be seen in this diagram example: Signatures One of the least intuitive constructs in xADL is the signature.

Case studies are used in many professional education programs, primarily in business school, to present real-world situations It is used to describe various aspects of the architecture of a software system. Constructs Defined in the Instances Schema The constructs defined in the instance schema are: In this diagram, we see a component with an internal architecture. Contact Us If you have questions not answered by this website, please feel free to contact the software architectures group at UC Irvine through the ArchStudio developer’s mailman protected email list at: When a type system is introduced, however, things become more complicated.

Understanding the Different Types of Case Studies If links had semantics, they would be connectors.

xadl case study

Others adopt a types-as-constraints model, where a type is simply a constraint over elements; any element meeting that constraint is “of that type” this implies that a single element like a component or connector could potentially have many, many types.

This lack caee a static set of allowed tags introduces a new problem into XML applications. Like the outer architecture, the inner architecture will also have interfaces. So, a link may link a particular “in” interface instance on component instance A to a particular “out” interface instance on connector instance B. In the instances case, subarchitectures are expressed in-linethat is, as a sub-element of the component instance or connector instance.


xADL – Concepts and Info – Guide

Some approaches adopt a fairly traditional programming-language style types-and-instances model. When this occurs, the “subarchitecture” element of the component or connector will contain: Case Studies What is a Case Study?

case study on xadl

XML, the eXtensible Markup Language, was originally created stydy annotate, or “mark up” text documents with semantic information. Architecture structure and types, Product families architectural versions, options, and variantsand Implementation mappings mappings from architecture types to their implementations.

xADL Distilled

This information is not present in HTML. For instance, Rapide focuses strongly on event-based communication between components and simulatable specifications, to the exclusion of other aspects of software architecture.

How can they ensure that their information is marked up in a consistent way that is meaningful to xdal of them?

case study on xadl

However, the cass clients share a type, and they also share a subarchitecture two linked components called UI and Logic. In this model, components, connectors, and interfaces all have types called component typesconnector typesand interface typesrespectively. For the purposes of this discussion, we make a distinction between architecture instances, which exist at run-time, and structural elements, which exist at design-time.