diff --git a/package-lock.json b/package-lock.json
index 53d7fc8..f8bc0c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        },
-        "which-module": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-          "dev": true
-        },
-        "wrap-ansi": {
-          "version": "5.1.0",
-          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
-          "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^3.2.0",
-            "string-width": "^3.0.0",
-            "strip-ansi": "^5.0.0"
-          }
-        },
-        "y18n": {
-          "version": "4.0.1",
-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
-          "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
+        "decamelize": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-4.0.0.tgz",
+          "integrity": "sha512-9iE1PgSik9HeIIw2JO94IidnE3eBoQrFJ3w7sFuzSX4DpmZ3v5sZpUiV5Swcf6mQEF+Y0ru8Neo+p+nyh2J+hQ==",
           "dev": true
-        },
-        "yargs": {
-          "version": "13.3.2",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
-          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
-          "dev": true,
-          "requires": {
-            "cliui": "^5.0.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^2.0.1",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^2.0.0",
-            "set-blocking": "^2.0.0",
-            "string-width": "^3.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^4.0.0",
-            "yargs-parser": "^13.1.2"
-          }
-        },
-        "yargs-parser": {
-          "version": "13.1.2",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
-          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
         }
       }
     },
@@ -4358,6 +4158,12 @@
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
       "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
       "dev": true
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 8865dc0..6e743b2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "schemaorg-jsd",
-  "version": "0.17.0",
+  "version": "0.17.1",
   "description": "JSON Schema validation for JSON-LD files using Schema.org vocabulary.",
   "main": "index.js",
   "scripts": {
@@ -26,18 +26,18 @@
   "dependencies": {
     "@chharvey/requirejson": "^2.0.0",
     "@types/json-schema": "^7.0.2",
-    "@types/jsonld": "^1.5.2",
+    "@types/jsonld": "^1.5.4",
     "@types/node": "^14.0.23",
     "ajv": "^7.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^8.2.0",
     "gulp": "^4.0.0",
-    "gulp-mocha": "^7.0.2",
+    "gulp-mocha": "^8.0.0",
     "gulp-typedoc": "^2.2.1",
     "gulp-typescript": "^5.0.0",
     "ts-node": "^9.1.1",
     "typedoc": "^0.20.0",
-    "typescript": "~4.1.0"
+    "typescript": "~4.2.0"
   }
 }
diff --git a/src/build.ts b/src/build.ts
index ee67456..827224a 100644
--- a/src/build.ts
+++ b/src/build.ts
@@ -114,11 +114,9 @@ export function buildTS(jsonlddocument: JsonLdDocument): string {
 	const JSONLD: ReadonlyArray<NodeObject> = '@graph' in jsonlddocument ? jsonlddocument['@graph'] as NodeObject[] : [];
 	return [
 		`import {NodeObject} from 'jsonld';`,
-		...JSONLD.filter((jsonld): jsonld is SDO_LD => typeof jsonld['@type'] === 'string' && [
-			'rdfs:Datatype',
-			'rdfs:Class',
-			'rdf:Property',
-		].includes(jsonld['@type'])).map((jsonld) => jsonld.toTS()),
+		...JSONLD.filter((jsonld): jsonld is SDODatatypeLD => jsonld['@type'] === 'rdfs:Datatype') .map((jsonld) => SDODatatypeLD .toTS(jsonld)),
+		...JSONLD.filter((jsonld): jsonld is SDOClassLD    => jsonld['@type'] === 'rdfs:Class')    .map((jsonld) => SDOClassLD    .toTS(jsonld)),
+		...JSONLD.filter((jsonld): jsonld is SDOPropertyLD => jsonld['@type'] === 'rdf:Property')  .map((jsonld) => SDOPropertyLD .toTS(jsonld)),
 	].join('')
 }
 
diff --git a/src/sdo-ld.ts b/src/sdo-ld.ts
index 775595f..de9d4d5 100644
--- a/src/sdo-ld.ts
+++ b/src/sdo-ld.ts
@@ -45,38 +45,26 @@ export abstract class SDO_LD implements NodeObject {
 		this['rdfs:label']   = label(jsd);
 		this['rdfs:comment'] = jsd.description;
 	}
-	/**
-	 * Transform this Schema.org JSON-LD object into a string in TypeScript.
-	 * @returns a TypeScript type alias marking up the Schema.org object
-	 */
-	abstract toTS(): string;
 }
 
+
 /**
  * JSON-LD for a Schema.org Datatype.
  */
 export class SDODatatypeLD extends SDO_LD {
-	readonly '@type' = 'rdfs:Datatype';
-	/**
-	 * Transform a Schema.org Datatype JSON Schema into a JSON-LD object.
-	 * @param   jsd JSON Schema for a Schema.org Datatype
-	 * @returns JSON-LD marking up the Schema.org Datatype
-	 */
-	constructor (jsd: SDODatatypeSchema) {
-		super(jsd);
-	}
 	/**
-	 * Transform this Schema.org Datatype JSON-LD object into a string in TypeScript.
+	 * Transform a Schema.org Datatype JSON-LD object into a string in TypeScript.
+	 * @param datatypeLD the Schema.org Datatype JSON-LD to transform
 	 * @returns a TypeScript type alias marking up the Schema.org Datatype
 	 */
-	toTS(): string {
+	static toTS(datatypeLD: SDODatatypeLD): string {
 		return `
 			/**
-			 * ${ this['rdfs:comment'] }
+			 * ${ datatypeLD['rdfs:comment'] }
 			 *
-			 * @see http://schema.org/${ this['rdfs:label'] }
+			 * @see http://schema.org/${ datatypeLD['rdfs:label'] }
 			 */
-			export type ${ this['rdfs:label'] } = ${ new Map<string, string>([
+			export type ${ datatypeLD['rdfs:label'] } = ${ new Map<string, string>([
 				['Boolean',  'boolean'],
 				['Date',     'string'],
 				['DateTime', 'string'],
@@ -85,15 +73,48 @@ export class SDODatatypeLD extends SDO_LD {
 				['Text',     'string'],
 				['Time',     'string'],
 				['URL',      'string'],
-			]).get(this['rdfs:label'])! };
+			]).get(datatypeLD['rdfs:label'])! };
 		`.replace(/\n\t\t\t/g, '\n')
 	}
+
+	readonly '@type' = 'rdfs:Datatype';
+	/**
+	 * Transform a Schema.org Datatype JSON Schema into a JSON-LD object.
+	 * @param   jsd JSON Schema for a Schema.org Datatype
+	 * @returns JSON-LD marking up the Schema.org Datatype
+	 */
+	constructor (jsd: SDODatatypeSchema) {
+		super(jsd);
+	}
 }
 
+
 /**
  * JSON-LD for a Schema.org Class.
  */
 export class SDOClassLD extends SDO_LD {
+	/**
+	 * Transform a Schema.org Class JSON-LD object into a string in TypeScript.
+	 * @param classLD the Schema.org Class JSON-LD to transform
+	 * @returns a TypeScript interface marking up the Schema.org Class
+	 */
+	static toTS(classLD: SDOClassLD): string {
+		return `
+			/**
+			 * ${ classLD['rdfs:comment'] }
+			 *
+			 * ${ (classLD['superClassOf'].length) ? `*(Non-Normative):* Known subclasses:\n${        linklist(classLD['superClassOf'])                         }\n` : '' }
+			 * ${ (classLD['valueOf']     .length) ? `*(Non-Normative):* May appear as values of:\n${ linklist(classLD['valueOf'])     .replace(/}/g, '_type}') }\n` : '' }
+			 * @see http://schema.org/${ classLD['rdfs:label'] }
+			 */
+			export interface ${ classLD['rdfs:label'] } extends ${ (classLD['rdfs:subClassOf']) ? classLD['rdfs:subClassOf']['@id'].split(':')[1] : 'NodeObject' } {
+				${ classLD['rdfs:member'].map((member) => member['@id'].split(':')[1]).map((name) => `
+					${ name }?: ${ name }_type;
+				`.trim()).join('\n\t') }
+			}
+		`.replace(/\n\t\t\t/g, '\n');
+	}
+
 	readonly '@type' = 'rdfs:Class';
 	readonly 'rdfs:subClassOf': SingleReferenceLD | null;
 	readonly 'rdfs:member':     SingleReferenceLD[];
@@ -126,32 +147,33 @@ export class SDOClassLD extends SDO_LD {
 			;
 		});
 	}
+}
+
+
+/**
+ * JSON-LD for a Schema.org Property.
+ */
+export class SDOPropertyLD extends SDO_LD {
 	/**
-	 * Transform this Schema.org Class JSON-LD object into a string in TypeScript.
-	 * @returns a TypeScript interface marking up the Schema.org Class
+	 * Transform a Schema.org Property JSON-LD object into a string in TypeScript.
+	 * @param classLD the Schema.org Property JSON-LD to transform
+	 * @returns a TypeScript type alias marking up the Schema.org Property
 	 */
-	toTS(): string {
+	static toTS(propertyLD: SDOPropertyLD): string {
+		const rangeunion: string = `${ propertyLD['rdfs:range'].map((cls) => cls['@id'].split(':')[1]).join(' | ') }`
 		return `
 			/**
-			 * ${ this['rdfs:comment'] }
+			 * ${ propertyLD['rdfs:comment'] }
 			 *
-			 * ${ (this['superClassOf'].length) ? `*(Non-Normative):* Known subclasses:\n${        linklist(this['superClassOf'])                         }\n` : '' }
-			 * ${ (this['valueOf']     .length) ? `*(Non-Normative):* May appear as values of:\n${ linklist(this['valueOf'])     .replace(/}/g, '_type}') }\n` : '' }
-			 * @see http://schema.org/${ this['rdfs:label'] }
+			 * ${ (propertyLD['rdfs:subPropertyOf']       ) ? `Extends {@link ${ propertyLD['rdfs:subPropertyOf']['@id'].split(':')[1] }}`              : '' }
+			 * ${ (propertyLD['superPropertyOf']   .length) ? `*(Non-Normative):* Known subproperties:\n${ linklist(propertyLD['superPropertyOf']) }\n` : '' }
+			 * ${ (propertyLD['rdfs:domain']       .length) ? `*(Non-Normative):* Property of:\n${         linklist(propertyLD['rdfs:domain'    ]) }\n` : '' }
+			 * @see http://schema.org/${ propertyLD['rdfs:label'] }
 			 */
-			export interface ${ this['rdfs:label'] } extends ${ (this['rdfs:subClassOf']) ? this['rdfs:subClassOf']['@id'].split(':')[1] : 'NodeObject' } {
-				${ this['rdfs:member'].map((member) => member['@id'].split(':')[1]).map((name) => `
-					${ name }?: ${ name }_type;
-				`.trim()).join('\n\t') }
-			}
-		`.replace(/\n\t\t\t/g, '\n');
+			type ${ propertyLD['rdfs:label'] }_type = ${ rangeunion }${ (propertyLD['$rangeArray']) ? ` | (${ rangeunion })[]` : '' };
+		`.replace(/\n\t\t\t/g, '\n')
 	}
-}
 
-/**
- * JSON-LD for a Schema.org Property.
- */
-export class SDOPropertyLD extends SDO_LD {
 	readonly '@type' = 'rdf:Property';
 	readonly 'rdfs:subPropertyOf': SingleReferenceLD|null;
 	/**
@@ -182,24 +204,6 @@ export class SDOPropertyLD extends SDO_LD {
 		this['rdfs:range']         = jsd.definitions.ExpectedType.anyOf.map((schema) => ({'@id': `sdo:${ path.parse(schema.$ref).name }`}));
 		this.$rangeArray           = jsd.allOf[1].anyOf.length === 2;
 	}
-	/**
-	 * Transform this Schema.org Property JSON-LD object into a string in TypeScript.
-	 * @returns a TypeScript type alias marking up the Schema.org Property
-	 */
-	toTS(): string {
-		const rangeunion: string = `${ this['rdfs:range'].map((cls) => cls['@id'].split(':')[1]).join(' | ') }`
-		return `
-			/**
-			 * ${ this['rdfs:comment'] }
-			 *
-			 * ${ (this['rdfs:subPropertyOf']       ) ? `Extends {@link ${ this['rdfs:subPropertyOf']['@id'].split(':')[1] }}`              : '' }
-			 * ${ (this['superPropertyOf']   .length) ? `*(Non-Normative):* Known subproperties:\n${ linklist(this['superPropertyOf']) }\n` : '' }
-			 * ${ (this['rdfs:domain']       .length) ? `*(Non-Normative):* Property of:\n${         linklist(this['rdfs:domain'    ]) }\n` : '' }
-			 * @see http://schema.org/${ this['rdfs:label'] }
-			 */
-			type ${ this['rdfs:label'] }_type = ${ rangeunion }${ (this['$rangeArray']) ? ` | (${ rangeunion })[]` : '' };
-		`.replace(/\n\t\t\t/g, '\n')
-	}
 }
 
 /**