diff --git a/src/common/ecs/compiler.ts b/src/common/ecs/compiler.ts
index 33061c3f..922f0f37 100644
--- a/src/common/ecs/compiler.ts
+++ b/src/common/ecs/compiler.ts
@@ -13,10 +13,11 @@ export enum ECSTokenType {
 
 export class ECSCompiler extends Tokenizer {
 
-    em = new EntityManager(new Dialect_CA65()); // TODO
     currentScope: EntityScope | null = null;
 
-    constructor() {
+    constructor(
+        public readonly em: EntityManager)
+    {
         super();
         //this.includeEOL = true;
         this.setTokenRules([
@@ -53,9 +54,17 @@ export class ECSCompiler extends Tokenizer {
         }
     }
 
+    getImportFile: (path: string) => string;
+
+    importFile(path: string) {
+        let text = this.getImportFile && this.getImportFile(path);
+        if (!text) this.compileError(`I can't find the import file "${path}".`);
+        new ECSCompiler(this.em).parseFile(path, text);
+    }
+
     parseTopLevel() {
         //this.skipBlankLines();
-        let tok = this.expectTokens(['component', 'system', 'scope', 'resource', 'comment']);
+        let tok = this.expectTokens(['component', 'system', 'scope', 'resource', 'import', 'demo', 'comment']);
         if (tok.str == 'component') {
             return this.em.defineComponent(this.parseComponentDefinition());
         }
@@ -68,6 +77,16 @@ export class ECSCompiler extends Tokenizer {
         if (tok.str == 'resource') {
             return this.em.defineSystem(this.parseResource());
         }
+        if (tok.str == 'import') {
+            let tok = this.expectTokenTypes([ECSTokenType.QuotedString]);
+            let path = tok.str.substring(1, tok.str.length-1);
+            return this.importFile(path);
+        }
+        if (tok.str == 'demo') {
+            let scope = this.parseScope();
+            scope.isDemo = true;
+            return scope;
+        }
         if (tok.str == 'comment') {
             this.expectTokenTypes([ECSTokenType.CodeFragment]);
             return;
@@ -253,6 +272,7 @@ export class ECSCompiler extends Tokenizer {
     parseScope() : EntityScope {
         let name = this.expectIdent().str;
         let scope = this.em.newScope(name, this.currentScope || undefined);
+        scope.filePath = this.path;
         this.currentScope = scope;
         let cmd;
         while ((cmd = this.expectTokens(['using', 'entity', 'scope', 'comment', 'end']).str) != 'end') {
diff --git a/src/common/ecs/ecs.ts b/src/common/ecs/ecs.ts
index 461c86aa..dc1e3af9 100644
--- a/src/common/ecs/ecs.ts
+++ b/src/common/ecs/ecs.ts
@@ -56,7 +56,6 @@ crazy idea -- full expansion, then relooper
 */
 
 
-import { throws } from "assert";
 import { SourceLocated, SourceLocation } from "../workertypes";
 
 export class ECSError extends Error {
@@ -730,6 +729,8 @@ export class EntityScope implements SourceLocated {
     maxTempBytes = 0;
     resources = new Set<string>();
     state = new ActionState();
+    isDemo = false;
+    filePath = '';
 
     constructor(
         public readonly em: EntityManager,
@@ -1139,7 +1140,10 @@ export class EntityManager {
     exportToFile(file: SourceFileExport) {
         file.text(this.dialect.HEADER); // TODO
         for (let scope of Object.values(this.topScopes)) {
-            scope.dump(file);
+            // TODO: demos
+            if (!scope.isDemo) {
+                scope.dump(file);
+            }
         }
         file.text(this.dialect.FOOTER); // TODO
     }
diff --git a/src/common/tokenizer.ts b/src/common/tokenizer.ts
index 4fad3494..9c7b2ec7 100644
--- a/src/common/tokenizer.ts
+++ b/src/common/tokenizer.ts
@@ -171,7 +171,7 @@ export class Tokenizer {
     expectTokens(strlist: string[], msg?: string): Token {
         let tok = this.consumeToken();
         let tokstr = tok.str;
-        if (strlist.indexOf(tokstr) < 0) {
+        if (!strlist.includes(tokstr)) {
             this.compileError(msg || `There should be a ${strlist.map((s) => `"${s}"`).join(' or ')} here, not "${tokstr}".`);
         }
         return tok;
diff --git a/src/ide/project.ts b/src/ide/project.ts
index a399ef33..0c11974a 100644
--- a/src/ide/project.ts
+++ b/src/ide/project.ts
@@ -150,6 +150,7 @@ export class CodeProject {
       files.push(dir + '/' + fn);
   }
 
+  // TODO: use tool id to parse files, not platform
   parseIncludeDependencies(text:string):string[] {
     let files = [];
     let m;
@@ -199,13 +200,18 @@ export class CodeProject {
         this.pushAllFiles(files, m[2]);
       }
       // for wiz
-      let re5 = /^\s*(import|embed)\s+"(.+?)";/gmi;
+      let re5 = /^\s*(import|embed)\s*"(.+?)";/gmi;
       while (m = re5.exec(text)) {
         if (m[1] == 'import')
           this.pushAllFiles(files, m[2] + ".wiz");
         else
           this.pushAllFiles(files, m[2]);
       }
+      // for ecs
+      let re6 = /^\s*(import)\s*"(.+?)"/gmi;
+      while (m = re6.exec(text)) {
+        this.pushAllFiles(files, m[2]);
+      }
     }
     return files;
   }
diff --git a/src/test/testecs.ts b/src/test/testecs.ts
index 5e505300..1b626032 100644
--- a/src/test/testecs.ts
+++ b/src/test/testecs.ts
@@ -290,7 +290,8 @@ function testECS() {
 }
 
 function testCompiler() {
-    let c = new ECSCompiler();
+    let em = new EntityManager(new Dialect_CA65()); // TODO
+    let c = new ECSCompiler(em);
     try {
         c.parseFile(`
         // comment
diff --git a/src/worker/tools/ecs.ts b/src/worker/tools/ecs.ts
index 37a1eef7..3600ae1a 100644
--- a/src/worker/tools/ecs.ts
+++ b/src/worker/tools/ecs.ts
@@ -1,11 +1,15 @@
 import { ECSCompiler } from "../../common/ecs/compiler";
-import { ECSError } from "../../common/ecs/ecs";
+import { Dialect_CA65, ECSError, EntityManager } from "../../common/ecs/ecs";
 import { CompileError } from "../../common/tokenizer";
 import { CodeListingMap } from "../../common/workertypes";
 import { BuildStep, BuildStepResult, gatherFiles, getWorkFileAsString, putWorkFile, staleFiles } from "../workermain";
 
 export function assembleECS(step: BuildStep): BuildStepResult {
-    let compiler = new ECSCompiler();
+    let em = new EntityManager(new Dialect_CA65()); // TODO
+    let compiler = new ECSCompiler(em);
+    compiler.getImportFile = (path: string) => {
+        return getWorkFileAsString(path);
+    }
     gatherFiles(step, { mainFilePath: "main.ecs" });
     var destpath = step.prefix + '.ca65';
     if (staleFiles(step, [destpath])) {