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SOA Patterns for Cloud Apps

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Data Related SOA Design Patterns

Daily adhoc Pattern. Soaspecs.com. XSL Vs CSS. XSL versus CSS by Thomas Erl Adding XML to the mix of Web page elements allows for the distinct separation of presentation and content. But what if you wanted to base your presentation on the newfound content definitions provided by XML? There are two technologies that can make this happen: • Extensible Stylesheet Language (XSL) • Cascading Style Sheets (CSS) The Extensible Stylesheet Language (XSL), a supplementary technology for XML, allows for the definition of styles that can control both presentation and content output of queries made against XML documents. To understand XSL's relationship to XML, it is useful to understand the relationship between Cascading Style Sheets (CSS) and HTML. Since HTML is used to define the presentation of Web pages, including layout and formatting parameters, it is common to have to repeat several HTML statements throughout a document in order to duplicate a certain type of formatting style.

Server-side vs. Industry Support What about XSLT? Service Technology Magazine – Resources. "The Importance of Schema Design in SOA" Introduction XML Schemas are a fundamental part of any XML-based service oriented architecture. They define the structure and content of the messages that are passed among services. Enterprise architects, DBAs and software developers often devote a lot of time to carefully designing data: they create enterprise data models, data dictionaries with strict naming and documentation standards, and carefully designed and optimized relational databases. Unfortunately, service designers and implementers often do not pay as much attention to good design when it comes to XML messages. There are several reasons for this. Some people feel that since the XML messages are transitory, it is not important how they are structured. Some decide that it is easier to use whatever schema is generated for them by a toolkit.

As with any data design, there are many ways to structure XML messages. Uses for Schemas When designing an XML Schema, it is first important to understand what it will be used for. Arcitura's Channel. Cloud Computing & SOA Connection Points Part 1 of 5 by Thomas Erl. SOA Design Patterns. Three Specialized SOA Design Patterns (Audio) The ESB and Related Messaging Patterns (Audio) Esb architecture for soa. Data-Related SOA Design Patterns (Audio) Canonical schemas. Canonical schema pattern. Rationale[edit] The interaction between services often requires exchanging business documents. In order for a service consumer to send data (related to a particular business entity e.g. a purchase order), it needs to know the structure of the data i.e. the data model.

For this, the service provider publishes the structure of the data that it expects within the incoming message from the service consumer. In case of services being implemented as web services,[2] this would be the XML schema document. Once the service consumer knows the required data model, it can structure the data accordingly. However, under some conditions it may be possible that the service consumer already possesses the required data, which relates to a particular business document, but the data does not conform to the data model as specified by the service provider.

Usage[edit] Diagram A Service A is using a different data model as compared to Service B for the same business document. Considerations[edit] SOA Patterns - Master Pattern List (Category) OnSOA (Audio + Video) One of the greatest challenges to carrying out successful SOA projects is in understanding how they should be carried out. Without being able to rely on proven processes and practices, an SOA initiative can turn into a high-risk venture because you simply may not know what to expect.

A sound methodology can alleviate this risk by providing a solid foundation from where you can shape a delivery approach that accommodates your goals and requirements while also laying out a path to realizing the benefits of SOA and service-oriented computing. The concepts, processes, and strategies described throughout this site are part of a larger Mainstream SOA Methodology (MSOAM). This methodology is classified as "mainstream" because it really does just provide a set of generic processes and practices that almost always require further customization when incorporated into enterprise environments.

It is therefore best viewed as a starting point.