diff --git a/source/logic/base.ts b/source/logic/base.ts
index d3d2573..5978791 100644
--- a/source/logic/base.ts
+++ b/source/logic/base.ts
@@ -25,6 +25,7 @@ namespace _heimdall
 		null
 		|
 		int
+		/*
 		|
 		(
 			"minute"
@@ -35,6 +36,7 @@ namespace _heimdall
 			|
 			"week"
 		)
+		 */
 	);
 	
 	
diff --git a/source/logic/check_kinds/file_state.ts b/source/logic/check_kinds/file_state.ts
new file mode 100644
index 0000000..a3c6f2f
--- /dev/null
+++ b/source/logic/check_kinds/file_state.ts
@@ -0,0 +1,190 @@
+namespace _heimdall.check_kinds.file_state
+{
+	
+	/**
+	 */
+	function parameters_schema(
+	) : _heimdall.helpers.json_schema.type_schema
+	{
+		return {
+			"type": "object",
+			"additionalProperties": false,
+			"properties": {
+				"path": {
+					"type": "string"
+				},
+				"exist_mode": {
+					"description": "whether the file is supposed to exist or not",
+					"type": "boolean",
+					"default": true,
+				},
+				"exist_critical": {
+					"description": "whether a violation of the extist state (parameter 'exist_mode') shall be considered as critical (true) or concerning (false)",
+					"type": "boolean",
+					"default": true,
+				},
+				"age_threshold_concerning": {
+					"description": "in seconds; ignored if 'exist_mode' is set to false",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+				"age_threshold_critical": {
+					"description": "in seconds; ignored if 'exist_mode' is set to false",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+				"size_threshold_concerning": {
+					"description": "in bytes; ignored if 'exist_mode' is set to false",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+				"size_threshold_critical": {
+					"description": "in bytes; ignored if 'exist_mode' is set to false",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+				
+				// deprecated
+				"strict": {
+					"deprecated": true,
+					"description": "",
+					"type": "boolean",
+					"default": true,
+				},
+				"exist": {
+					"deprecated": true,
+					"description": "",
+					"type": "boolean",
+					"default": true,
+				},
+				"age_threshold": {
+					"deprecated": true,
+					"description": "",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+				"size_threshold": {
+					"deprecated": true,
+					"description": "",
+					"type": ["null", "integer"],
+					"exclusiveMinimum": 0,
+					"default": null,
+				},
+			},
+			"required": [
+				"path",
+			]
+		};
+	}
+	
+	
+	/**
+	 */
+	function normalize_order_node(
+		node : any
+	) : any
+	{
+		const version : string = (
+			(! ("exist_mode" in node)
+			? "v1"
+			: "v2"
+		);
+		
+		switch (version) {
+			default: {
+				throw (new Error("unhandled version"));
+				break;
+			}
+			case "v1": {
+				if (! ("path" in node)) {
+					throw new Error("missing mandatory field 'path'");
+				}
+				else {
+					const node_ = Object.assign(
+						{
+							"strict": true,
+							"exist": true,
+							"age_threshold": null,
+							"size_threshold": null,
+						},
+						node
+					);
+					return {
+						"exist_mode": node_["exist"],
+						"exist_critical": node_["strict"],
+						"age_threshold_concerning": (
+							node_["strict"]
+							? null
+							: node_["age_threshold"]
+						),
+						"age_threshold_critical": (
+							node_["strict"]
+							? node_["age_threshold"]
+							: null
+						),
+						"size_threshold_concerning": (
+							node_["strict"]
+							? null
+							: node_["age_threshold"]
+						),
+						"size_threshold_critical": (
+							node_["strict"]
+							? node_["age_threshold"]
+							: null
+						),
+					};
+				}
+				break;
+			}
+			case "v2": {
+				if (! ("path" in node)) {
+					throw new Error("missing mandatory field 'path'");
+				}
+				else {
+					const node_ = Object.assign(
+						{
+							"exist_mode": true,
+							"exist_critical": true,
+							"age_threshold_concerning": null,
+							"age_threshold_critical": null,
+							"size_threshold_concerning": null,
+							"size_threshold_critical": null,
+						},
+						node
+					);
+					return node_;
+				}
+				break;
+			}
+		}
+	}
+	
+	
+	/**
+	 */
+	async function run(
+		parameters
+	) : Promise<_heimdall.type_result>
+	{
+		return Promise.reject<_heimdall.type_result>(new Error("not implemented"));
+	}
+	
+	
+	/**
+	 */
+	export function check_kind_implementation(
+	) : type_check_kind
+	{
+		return {
+			"parameters_schema": parameters_schema,
+			"normalize_order_node": normalize_order_node,
+			"run": run,
+		};
+	}
+	
+}