The 21st Century Architecture at NFJS
I took just about the whole series of the 21st Century architecture at NFJS 2010 with Brian Sletten. Services (i.e. SOA) is not dead, however expensive is. Avoid the center down approach, and instead use the ecosystem based approach. Invest in the RESTful style. A little complicated, but you are investing in the future. Rest is not about behavior, but about information. It is not a SOAP replacement. Rest gives the freedom to negotiate in the format you like (i.e atom,rss, etc). Leonard Richardson introduced the Rest Maturity Model with Soap being level 0, URL resources level 1, http level 2, and hypermedia level 3. For example, twitter uses alot of JSON and not hypermedia. Some properties to consider with REST is performance (i.e. maybe the first request requires the greatest server hit, and subsequent requests do not), scalability (how it handles the load and scles down for different devices), stateless (part of request), uniform interface (don’t need WSDL), minimize layering. Rest Triangle : Npuns, Verbs, Representations. The important http methods with REST include : Get is a state transfer from server of a resource (i.e. web page), Head is constrained version of Get. Info about resource (i.e. header), Post is where accept by the server at this time an information resource, don’t know if it is recieved by server. (i.e form handling) create and update. Example in early days was usenet news, Put is do know resource. Overwrite idempotent record, Patch is more explecit version of Post, Delete is idempotent, Options ask if allowed to do something. An overview of Http return codes : 200s everything is cool, 204 no response, 300s good stewards (more information), 303 non-networkable address, 400s you screwed up, 500s server in bad state try again laterGood book is Rest In Practice. Artucles: InfoQ on Rest , Rest for Java Developers, Restlets , Net Kernal , The future is Rest . JSR 311 : http://www.infoq.com/news/2008/09/jsr311-approved
Semantic web has public and private link information. Microformats standard, but no common model. RDF is new enabling technology to focus on concepts that provides a global guide to webs of data.Information has a context so people can use it. Purl.org web site example that uses foaf (friend of a friend) with birthday handle. DBpedia data set. Gleaning Resource Descriptions from Dialects of Languages (GRDDL) W3C recommendation structured content. RRFa is RDF attributes (metadata). RDFa is a way to label content to describe a specific type of information, such as a restaurant review, an event, a person, or a product listing. These information types are called entities. Each entity has a number of properties . Freebase , Adaptive Blue. The Curie processing / RDFa spec. The Open Graph protocol enables any web page to become a rich object in a social graph. Enables any web page to have the same functionality as a Facebook Page. The Web Ontology for eCommerce can be found at Good Relations (see best buy). Semantic Web at InfoQueue . Rdfa split. ODF use of RDFA . Books: Pull: The Power of the Semantic Web to Transform Your Business. CommonTag. RDFa test page. RDFa distiller. rdfa.info web site. RDFa parser for fragments. Details on Whitehouse. gov site that uses RDFa .Taxonomy blog. Basics, Long tail
RDF triple , librdf.org/query , rdf about ,rdf-sparql-query , linked data , mulgara.org , sparql query , twinkle, govtrack sparql , reyvu.com with twinkle , relfinder with Kill Bill. Lastly, google supports RDFA
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