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an directive like "datafield" is the basic building block for a webcomponent, see "Create Components" section at: http://angularjs.org (especially see the component.js tab there)

So every webcomponent consists out of 3 parts/files:

1. the webcomponent controller javascript file (does the adding of directive, and likely contains controller javascirpt to-do for example remote calls)
2. the webcomponent html template (might for example contain the "ng-click" handler to webcomponent javascript controller)
3. the webcomponent spec (internally called beanInfo, defines all properties and types, see child page)