How do you define a layout template in the liferay-look-and-feel.xml?

Defining a layout template in the liferay-look-and-feel.xml file is done by using the layout-template tag. This tag specifically allows developers to create tailored layouts for their portlets and pages within the Liferay framework. It provides the framework with the necessary structure and semantics to recognize what constitutes a layout for a given theme.

When the layout-template tag is employed, it can encompass various attributes, such as specifying the template's name and design features, which can then be referenced when configuring pages in the Liferay Portal. This provides flexibility in theme design, enabling developers to implement diverse layouts that enhance user experience.

Other methods like setting up a CSS class, including a thumbnail path, or adding custom JavaScript functionality, do not specifically define layout templates. While these elements can be vital in theme development, they serve different purposes—styling, visual representation, or functionality enhancement—rather than the foundational layout design established by the layout-template tag. Thus, the correct approach to defining a layout template involves directly using the layout-template tag in the configuration file.