Application
This unit applies to software developers responsible for implementing and supporting web services for building distributed applications.
It relates to the specialist skills and knowledge specific to the implementation and consumption of web services, the related communications protocols and the associated XML technologies used in web services. This unit does not address the specialist programming skills or knowledge required for web services, these are addressed in other units of competency.
Prerequisites
Not applicable.
Elements and Performance Criteria
1. Use eXtensible markup language (XML) to provide information | 1.1 Create XML data structures from various data sources 1.2 Manipulate XML data structures using a common application programming interface (API) 1.3 Use namespaces to scope elements from multiple XML documents 1.4 Validate XML data structures using a schema 1.5 Map and transform an XML document from one schema to another |
2. Use the web service description language (WSDL) to promote a web service | 2.1 Understand the purpose of the WSDL 2.2 Identify the three main elements that comprise the web service description language 2.3 Build a WSDL file 2.4 Provide web access to a WSDL file via a uniform resource locator (URL) |
3. Use universal description, discovery, and integration (UDDI) to locate and retrieve information about a public web service | 3.1 Identify the purpose of UDDI 3.2 Understand the differences between public, extra-enterprise and intra-enterprise UDDI registry deployments 3.3 Locate and retrieve information about a public web service using UDDI 3.4 Identify the relationship between WSDL and UDDI |
4. Access web services using the simple object access protocol (SOAP) | 4.1 Identify the purpose of SOAP 4.2 Determine the relationship between UDDI and SOAP 4.3 Identify the basic structure and processing of a SOAP message 4.4 Retrieve an XML document from a public web service using SOAP |
5. Implement a web service | 5.1 Outline a basic web service architecture 5.2 Implement, test and publish a web service 5.3 Incorporate and test a web service into an application |
Required Skills
Required skills
analytical skills to:
analyse functional requirements
assess proposed web service architectures within the context of existing enterprise technologies, infrastructure and industry standards
determine appropriate enabling technologies required to implement a web service’s functional requirements
determine appropriate web service architectures as prescribed by the selected proprietary or industry standards
determine development environments appropriate to planned web service architectures and functionality
communication skills to:
describe and evaluate web service architectures with system analysts and enterprise architects
negotiate enterprise web service requirements with clients
negotiate resource requirements, project timeframes and project deliverables
propose web service functionality to meet the business needs of clients
learning skills to:
acquire the skills and knowledge required for the implementation of web services
stay at the cutting edge of industry developments and industry standards
literacy skills to:
interpret associated industry and web service standards
interpret existing enterprise technology infrastructure documentation
write functional requirement specifications for a web service
planning and organising skills to:
plan an effective solution for a web service
organise resources, documentation and infrastructure elements required for the implementation of a web service
problem-solving skills to:
debug code, identify code bugs and resolve all code exceptions
identify and implement solutions to problems with web service architecture and functionality
identify problems with XML document schemas and implement solutions
recommend solutions to problems or deficiencies associated with the implementation of web services
research skills to:
enhance knowledge of industry standards and trends related to web service architectures and enabling technologies
identify and locate sources of information that provide solutions to technical problems
identify sources of information and documentation required to plan and implement a web service
technical skills to:
implement complex code algorithms required for web service functionality
implement exception handling routines in code
re-factor code to improve the efficiency of the code
use an integrated development environment to build web service components
write code to implement a web service.
Required knowledge
integrated-development environments
web development technologies
web-service architecture.
Evidence Required
The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.
Overview of assessment | |
Critical aspects for assessment and evidence required to demonstrate competency in this unit | Evidence of the ability to: transform data from relational or other native data sources into XML validate an XML document using a predefined schema provide access to business functionality via a WSDL file locate a public web service business function and include it in a website using UDDI and SOAP implement a web service: according to business requirement specifications that adheres to industry standards. |
Context of and specific resources for assessment | Assessment must ensure access to: web service business requirement specifications industry standards published by the W3C platform-specific documentation and help files describing the syntax and use of proprietary technologies a simulated development environment incorporating the following elements: relational database server integrated development environment (IDE), including related frameworks, APIs and associated proprietary classes required to implement web services and their enabling technologies web server web browsers XML editors XPath testing utilities appropriate learning and assessment support when required modified equipment for people with special needs. |
Method of assessment | A range of assessment methods should be used to assess practical skills and knowledge. The following examples are appropriate for this unit: written or verbal questioning to assess candidate’s knowledge of XML data structures, syntax and validation techniques observation of candidate demonstrating: data transformation from relational data to validated XML the use of XPath queries to extract information from XML or transform XML data structures evaluation of candidate’s project incorporating all elements of this unit of competency, including both web service publication and web service consumption. |
Guidance information for assessment | Holistic assessment with other units relevant to the industry sector, workplace and job role is recommended, where appropriate. Assessment processes and techniques must be culturally appropriate, and suitable to the communication skill level, language, literacy and numeracy capacity of the candidate and the work being performed. Indigenous people and other people from a non-English speaking background may need additional support. In cases where practical assessment is used it should be combined with targeted questioning to assess required knowledge. |
Range Statement
The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
XML data structures may include: | electronic business XML (ebXML) XML 1.0 specification produced by the world wide web consortium (W3C). |
Various data sources may include: | comma separated value files native data sources, such as ASCII or the Java-type system object linking and embedding (OLE) DB data sources, such as spreadsheet files relational database management systems, such as: IBM DB2 Microsoft Structured Query Language (MS SQL) server Microsoft Access MySQL Oracle Ingres. |
Common application programming interface may include: | ASP.Net and MSXML and associated APIs Java XML API (JAXP) simple API for XML (SAX) document object model as described by W3C recommendation. |
Schema may include: | document type definition (DTD) schema file XML schema definition (XSD) file as described by W3C recommendation XML-data reduced (XDR) schema definition file. |
Map and transform may include: | eXtensible stylesheet language transformations (XSLT) XLink XPath 1.0 and XPath 2.0 queries XPointer XQuery. |
Three main elements may include identifying: | contents and data types of web service messages operations of web service messages protocols of web service messages. |
Public web service may include: | public web services located through UDDI registries. |
Publish may include: | limiting access to the web service to a local intranet making the web service available to the internet via a public UDDI registry simulating the publication of the web service through a virtual machine infrastructure. |
Sectors
Web
Employability Skills
This unit contains employability skills.
Licensing Information
No licensing, legislative, regulatory or certification requirements apply to this unit at the time of endorsement but users should confirm requirements with the relevant federal, state or territory authority.