What is the difference between JSF Custom Components and Facelets Composite Components?
BalusC
JSF custom components are Java classes which extend UIComponent. Facelets composite components are XHTML files which use http://java.sun.com/jsf/composite namespace.
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来源：https://stackoverflow.com/questions/5704620/what-is-the-difference-between-custom-components-and-composite-components