{
        "name": "display_expression",
	"type": "function",
        "description": "Returns the display expression for a given feature in a layer. If called with no parameters, it evaluates the current feature. The expression is evaluated by default.",
        "arguments": [
                {
                        "arg": "feature",
                        "optional": true,
                        "default": "current feature",
                        "description": "The feature which should be evaluated."
		},
                {
                        "arg": "layer",
                        "optional": true,
                        "default": "current layer",
                        "description": "The layer (or its id or name)."
                },
		{
			"arg": "evaluate",
                        "description": "If the expression must be evaluated. If false, the expression will be returned as a string literal only (which could potentially be later evaluated using the 'eval' function).",
			"optional": true,
			"default": "true"
		}
	],
        "examples": [
                {
                        "expression": "display_expression()",
                        "returns": "The display expression of the current feature."
                },
                {
                        "expression": "display_expression($currentfeature)",
                        "returns": "The display expression for a given feature."
		},
		{
                        "expression": "display_expression('a_layer_id', $currentfeature, 'False')",
                        "returns": "The display expression of the current feature not evaluated."
		}
	]
}