The Concepts Underlying UDDI in Visual Studio .NET

Encode Quick Response Code in Visual Studio .NET The Concepts Underlying UDDI
The Concepts Underlying UDDI
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The public UDDI registry works a little like the Internet domain name service (DNS) Businesses can register with any of the hosts IBM, HP, SAP, or Microsoft and the information they provide will be placed into the database at that host site At regular intervals, at least nightly, all information placed into one of the host site databases is replicated to the other host site databases, ensuring that they are all kept in synch Users requesting data about a business can then receive the same information about a registered business from any of the host databases When it needs to update the data, however, a business must return to the original site to which the data was placed and execute the update function Registry replication works similarly to DNS
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For obvious reasons, security is a primary concern of UDDIorg members Businesses are authorized to update information by one of the operators and therefore must return to the original operator to change or to delete any information they posted Businesses wishing to register with UDDI must first obtain authorization to do so and must be approved by a least one of the t operators Approval means sending to the business an authorization token that allows the business to log onto the UDDI site and to store or to update data Authorization to update the registry is handled by the operators individually; login information from one operator will not work for another For all practical purposes, someone registering information with UDDI has to choose one of the operators and stick with that operator Security is a prime concern
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Another primary concern is the quality, or validity, of the data Someone has to ensure that the business being registered is a real business; that the business name, ID number, category information, phone number, Web page, and street address are correct; and that the business category and geographical information are correct UDDI v2 is set up to allow third parties to do this and does validate category data Data validity is another primary concern
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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UDDI has two main parts: registration and discovery The registration part means that businesses can post information to UDDI that other businesses can search for and discover, which is the other part Businesses and individuals interact with UDDI by using SOAP APIs or one of the user interfaces provided by the operators or other Web services vendors UDDI operators post WSDL descriptions of their Web services for registration and discovery UDDI provides separate WSDL files for registration and discovery services, using its own XML document format The two main parts of UDDI are registration and discovery
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Some UDDI SOAP APIs are used for inserting information into the registry; others, for browsing and retrieving specific information from the registry UDDI APIs require a specific subset of SOAP; that is, UDDI does not use the optional seria lization format and some other features defined in the SOAP specification (See UDDI Support for SOAP and Unicode, later in this chapter for further information) SOAP APIs are used to submit and to retrieve data
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How UDDI Works
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UDDI information is often described as being divided into three main categories of business information:
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White Pages: Business name and address, contact information, Web site name, and Data Universal Numbering System (DUNS) or other identifying number Yellow Pages: Type of business, location, and products, including various categorization taxonomies for geo-graphical location, industry type, business ID, and so on UDDI contains White Pages, Yellow Pages, and Green Pages information
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Issues with UDDI Acceptance
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Part of the problem that UDDI has to overcome is trust In other words, will businesses really trust private vendors to host and operate such a thing Another issue is standardization In other words, will UDDI really become a recognized standard Usefulness of the model may also be questioned, meaning that the proposed categorization of businesses, business information, and Web services interface information may not prove to be useful Finally, there is a thorny legal issue with respect to doing business over the Web, including Web services Is a business-to-business interaction over the Web equivalent legally to a paper-document exchange using a fax machine or regular mail Another fundamental question confronting UDDI and its users is: What does it mean that businesses are categorized Does it somehow relate to contact information Isn't the most important thing what a business sells rather than its geographical location Is the location of a business in a physical sense as relevant as what it supports in terms of interactions over the Internet With all the outstanding questions about proper and useful categorization, it's likely that the full realization of UDDI's potential is several years away if ever
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