What's the name of mark up language followed in Zk
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ZUML
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XML
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HTML
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XHTML
ZUML (ZK User Interface Markup Language) is the XML-based markup language used in ZK framework for defining user interface components. It is ZK's own markup extension, not standard XML, HTML, or XHTML. ZUML allows developers to declare UI components in a declarative manner while embedding Java code and ZK-specific features.
ZUML is correct. ZK is a Java-based Ajax web framework, and its UI is defined declaratively using ZUML (ZK User Interface Markup Language), an XML-based markup dialect specific to ZK, similar in spirit to how JSF uses Facelets or XAML is used in WPF. Plain XML, HTML, and XHTML are general-purpose markup languages that ZUML documents are built on top of / similar to syntactically, but ZK's own specific markup language — the one 'followed' by ZK page definitions (.zul files) — is ZUML, making the other three technically-related but incorrect answers.