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API / Apache Wicket Interview questions

Define markup inheritance in Wicket?

Markup inheritance lets a Wicket Page or Panel share a common HTML layout (header, navigation, footer) with subclasses, the same way Java class inheritance shares behavior — without a separate templating language.

A base page declares a <wicket:child/> tag marking where subclass-specific content should be inserted, and its Java class is written to be extended. A subclass's own HTML file then wraps its unique content in a <wicket:extend> block, and Wicket merges the two at render time: the base page's surrounding markup stays intact, and whatever sits inside wicket:extend replaces the wicket:child placeholder.

This is the standard way to avoid copy-pasting the same header and footer markup into every page of an application — a BasePage defines the shared chrome once, and every other page simply extends it in Java and supplies its own wicket:extend block in HTML.

What tag does a base page use to mark where a subclass's content should be inserted?
What does a subclass's own HTML file use to supply its unique content in markup inheritance?

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