Mashups: The new breed of Web app
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Like these "bastard pop" songs, a mashup is an unusual or innovative composition
of content (often from unrelated data sources), made for human (rather than
computerized) consumption.
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Enter the Semantic Web, which is the vision that the existing Web can be augmented to supplement the content designed for humans with equivalent machine-readable information. In the context of the Semantic Web, the term information is different from data; data becomes information when it conveys meaning (that is, it is understandable). The Semantic Web has the goal of creating Web infrastructure that augments data with metadata to give it meaning, thus making it suitable for automation, integration, reasoning, and re-use.
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RDF provides for the construction of relationships between data objects through subject-predicate-object triples ("subject S has relationship R with object O"). The combination of data model and graph of relationships allows for the creation of ontologies, which are hierarchical structures of knowledge that can be searched and formally reasoned about
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mashup development is replete with technical challenges that need to be addressed, especially as mashup applications become more feature- and functionality-rich.
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the number one enterprise IT concern today is data integration within the enterprise virtual organization
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translation systems between data models must be designed
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The Ajax model of Web development can provide a much richer and more seamless user experience than the traditional full-page-refresh, but it poses some difficulties as well.
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One such set of tools are the robots, spiders, and Web crawlers that aggregate information for Internet and intranet search engines. Without graceful degradation, Ajax-based mashup applications might find themselves missing out on both a minority user base as well as search engine visibility.
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Single-signon is a desirable feature, but there are a multitude of competing technologies (ranging from Microsoft Passport to the Liberty Alliance), thus creating disjointed identity namespaces that you must integrate as well. Content providers are likely to employ authentication and authorization schemes (which require the notion of secure identity or securely identifiable attributes) in their APIs to enforce business models that involve paid subscriptions or sensitive data.
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Before mashups can make the transition from cool toys to sophisticated applications, much work will have to go into distilling robust standards, protocols, models, and toolkits.
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