added missing files from editor branch

.gitmodules

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+[submodule "curriculum-basis"]
+	path = curriculum-basis
+	url = https://github.com/slonl/curriculum-basis

README.md

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+# curriculum-fo
+ SLO Wettelijk Curriculum FO (Kerndoelen en Examenprogramma's Funderend onderwijs)

package.json

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+{
+  "name": "curriculum-fo",
+  "description": "Curriculum Context: SLO Wettelijk Curriculum FO (Kerndoelen en Examenprogramma's Funderend onderwijs)",
+  "main": "context.json",
+  "scripts": {
+    "test": "node test/test.mjs",
+    "repl": "NODE_REPL_HISTORY=.repl_history && node test/repl.mjs"
+  },
+  "author": "SLO",
+  "license": "MIT",
+  "dependencies": {
+    "ajv": "^6.5.5",
+    "curriculum-js": "^0.3.7",
+    "jsondiffpatch": "^0.3.11",
+    "uuid": "^3.3.2"
+  }
+}

schema.jsonld

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+{
+	"@context": {
+		"fo": "http://opendata.slo.nl/curriculum/schemas/fo.jsonld",
+		"id": {
+			"@id": "@id"
+		},
+		"title": {
+			"@id": "http://purl.org/dc/terms/title",
+			"@type": "@id"
+		},
+		"description": {
+			"@id": "http://purl.org/dc/terms/description",
+			"@type": "@id"
+		},
+		"fo_domein": {
+			"@id": "fo:#fo_domein"
+		},
+		"fo_subdomein": {
+			"@id": "fo:#fo_subdomein"
+		},
+		"fo_doelzin": {
+			"@id": "fo:#fo_doelzin"
+		},
+		"fo_toelichting": {
+			"@id": "fo:#fo_toelichting"
+		},
+		"fo_uitwerking": {
+			"@id": "fo:#fo_uitwerking"
+		},
+		"deprecated": {
+			"@id": "fo:#Deprecated"
+		}
+	}
+}

test/repl.mjs

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+// load the curriculum-js library
+import Curriculum from 'curriculum-js'
+// load node filesystem support
+import fs from 'fs'
+import repl from 'repl';
+
+// create an async function, so we can use await inside it
+async function main() {
+
+    // create new curriculum instance
+    const curriculum = new Curriculum()
+
+    // read the list of all contexts from the file /curriculum-contexts.txt
+    const schemas = fs.readFileSync('curriculum-contexts.txt','utf8')
+        .split(/\n/g)             // split the file on newlines
+        .map(line => line.trim()) // remove leading and trailing whitespace
+        .filter(Boolean)          // filter empty lines
+
+    // load all contexts from the editor/ and master/ folders
+    let loadedSchemas = schemas.map(
+        schema => curriculum.loadContextFromFile(schema, schema+'/context.json')
+    ).concat(
+        curriculum.loadContextFromFile('curriculum-fo', 'context.json')
+    )
+
+    // wait untill all contexts have been loaded, and return the promise values as schemas
+    Promise.allSettled(loadedSchemas).then((settledSchemas) => {
+        loadedSchemas = settledSchemas.map(promise => promise.value)
+    })
+    .then(() => {
+
+        var server = repl.start({
+            ignoreUndefined: true
+        });
+
+        server.context.curriculum = curriculum;
+        if (process.env.NODE_REPL_HISTORY) {
+            server.setupHistory(process.env.NODE_REPL_HISTORY, (e) => { if (e) console.log(e); } );
+        } else {
+            console.log('Set environment variable NODE_REPL_HISTORY=.repl_history to enable persistent REPL history');
+        }
+
+    })
+}
+
+main()

test/test.mjs

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+import Curriculum from "curriculum-js";
+
+async function validate() {
+	var curriculum = new Curriculum();
+	var schema = await curriculum.loadContextFromFile(
+    "curriculum-fo",
+    "context.json"
+  );
+	await curriculum.loadContextFromFile(
+    "curriculum-fo",
+    "curriculum-basis/context.json"
+  );
+	try {
+		await curriculum.validate(schema);
+		console.log("Data is valid!");
+	} catch (error) {
+		error.validationErrors.forEach((error) => {
+			console.log(error.instancePath + ": " + error.message);
+		});
+	}
+}
+
+validate();