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Web APIs are the defined interfaces through which interactions happen between an enterprise and applications that use its assets, which also is a [[Service-level agreement|Service Level Agreement]] (SLA) to specify the functional provider and expose the service path or URL for its API users. An API approach is an architectural approach that revolves around providing a program interface to a set of services to different applications serving different types of consumers.<ref>{{cite web |url=http://www.hcltech.com/sites/default/files/apis_for_dsi.pdf |website=www.hcltech.com |format=PDF download |title=API-fication |date=August 2014}}</ref>
When used in the context of [[Web development tools|web development]], an API is typically defined as a set of specifications, such as [[Hypertext Transfer Protocol]] (HTTP) request messages, along with a definition of the structure of response messages, usually in an Extensible Markup Language ([[XML]]) or JavaScript Object Notation ([[JSON]]) format. An example might be a shipping company API that can be added to an eCommerce-focused website to facilitate ordering shipping services and automatically include current shipping rates, without the site developer having to enter the shipper's rate table into a web database. While "web API" historically virtually has been synonymous for [[web service]], the recent trend (so-called [[Web 2.0]]) has been moving away from Simple Object Access Protocol ([[SOAP]]) based web services and [[service-oriented architecture]] (SOA) towards more direct [[representational state transfer]] (REST) style [[web resource]]s and [[resource-oriented architecture]] (ROA).<ref>{{cite web
|first = Djamal
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|title = Services Mashups: The New Generation of Web Applications
|url = http://dsonline.computer.org/portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline/2008/09&file=w5gei.xml&xsl=article.xsl
|work = IEEE Internet Computing, vol. 12, no. 5
|publisher = Institute of Electrical and Electronics Engineers
|pages = 13–15
|year = 2008
|access-date = 2019-10-01
|archive-url = https://web.archive.org/web/20110928211221/http://dsonline.computer.org/portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline%2F2008%2F09&file=w5gei.xml&xsl=article.xsl
</ref> Part of this trend is related to the [[Semantic Web]] movement toward [[Resource Description Framework]] (RDF), a concept to promote web-based [[ontology engineering]] technologies. Web APIs allow the combination of multiple APIs into new applications known as [[mashup (web application hybrid)|mashup]]s.<ref>▼
|archive-date = 2011-09-28
|url-status = dead
▲}}</ref> Part of this trend is related to the [[Semantic Web]] movement toward [[Resource Description Framework]] (RDF), a concept to promote web-based [[ontology engineering]] technologies. Web APIs allow the combination of multiple APIs into new applications known as [[mashup (web application hybrid)|mashup]]s.<ref>
{{citation
|first = James
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