Viewing Definition

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Basics

Quick Definition Lookup makes it possible to view definition of a symbol (tag, class, method/function, field, etc.) in a pop-up window.

For markup languages, MPS retrieves definitions of symbols from the specified DTD or schema. For details, see XML.

Do one of the following:

On the main menu, choose View | Quick Definition.
Press N/A.
Keeping the Ctrl key pressed, point with your mouse cursor to the symbol of interest, so that it turns to a hyperlink, with the definition of the symbol displayed in a tooltip. Clicking this hyperlink results in opening the respective definition page in the editor.
Quick definition tooltip shows hyperlinks to the symbols involved.

When you move your mouse pointer within the tooltip, a pin button appears. If you pin the tooltip, documentation for the symbol at caret is displayed in the Documentation Tool Window.

Use the icons on the toolbar of the pop-up window to navigate to the source code of the definition and view its usages.

Icon	Keyboard shortcut	Action
	`N/A` `N/A`	Navigate to the previous/next screen in the definition pop-up window after using hyperlinks in the definition. On a macOS computer, you can also use the three-finger right-to-left and left-to-right swipe gestures.
	`N/A`	Open the source code of the definition for editing, and close the quick definition lookup window.
	`N/A`	Open the source code of the definition, and preserve the quick definition lookup window opened.