1. DVOY A Voyager for Distributed 4-Dimensional Geo-Data

2. Diff Calculus Sun's slant, Engstro m says, is to provide a complet e "stack" of Web service s infrastr ucture, which include s develop ment tools, applicat ion server platfor ms, and Sun's server hardwa re. In his own depart ment, Engstro m says Sun is "all about making develop ers more producti ve—by doing the little things the standar d doesn't address." One exampl e of this process is a tool to bring existing applicat ions (such as SAP, People Soft, and IBM CICS progra ms) into the Web- service s arena with XML adapter s. "A big issue for us is how to retrofit," Engstro m says. "Becau se the applicat ions running today are not going away." Service Registry Service Provider Publish UDDI, WSDL Provider Proxy Service User

3. Diff Calculus Sun's slant, Engstro m says, is to provide a complet e "stack" of Web service s infrastr ucture, which include s develop ment tools, applicat ion server platfor ms, and Sun's server hardwa re. In his own depart ment, Engstro m says Sun is "all about making develop ers more producti ve—by doing the little things the standar d doesn't address." One exampl e of this process is a tool to bring existing applicat ions (such as SAP, People Soft, and IBM CICS progra ms) into the Web- service s arena with XML adapter s. "A big issue for us is how to retrofit," Engstro m says. "Becau se the applicat ions running today are not going away." Service Broker Service Provider Publish Service User Find Access

4. Web Service Actions and Components Service Broker Service Provider Publish Service User Find Access Web Services architecture requires three operations: publish, find, and bind. Service providers publish services to a service broker. Service users find the services and get access key from a service broker With the key, users access the service.

5. Web Service Standards Service Broker Service Provider Publish UDDI, WSDL Service User Find UDDI, WSDL Access SOAP, XML Each operation is governed by standard protocols: Discovery and Integration: UDDI (Universal Description, Discovery and Integration) Service Description: WSDL (Web Services Description Language) Content Envelope: SOAP (Simple Object Access Protocol) Data Encoding: XML (Extensible Modeling Language)

6. Web Service Standards Service Broker Service Provider Publish UDDI, WSDL Service User Find UDDI, WSDL Access SOAP Each operation is governed by a separate standard. Service providers publish services to a service broker. Service users find the services and get access key from a service broker With the key, users access the service.

7. Portal Server A portal solution seemed to fit BHCS's goals well. Commercial portals like Excite or Yahoo! are well known. They provide a specially formatted window onto a variety of data, whose source is invisible to users. Enterprise portals work the same way, letting users in an organization view a customized presentation of information from many sources. Interactive portal vendors like Sequoia—the vendor BHCS ultimately chose—also standardize access to information sources, including legacy apps and databases. This permits updates to data, merging data from different sources, and supporting search capabilities based on the context of the data Mapping Legacy Apps to XML How do you handle all those legacy apps? XPS can adapt to each individual legacy app's schemas, mapping their native fields and formats to XML tags and permitting XML-based indexing in context. Once legacy data has been converted to XML, administrators can then map data elements from different information sources that actually correspond to the same logical entity. For example, "name" in one document may be the same as "insurance subscriber" in another document; in a new app, these could both map to "patient."