diff --git a/src/app/app.ts b/src/app/app.ts
index 45fcf789..6f0b10b9 100644
--- a/src/app/app.ts
+++ b/src/app/app.ts
@@ -10,18 +10,22 @@ import { BooleanNode } from '../nodes/BooleanNode'
 import { MapNode } from '../nodes/MapNode'
 import { NumberNode } from '../nodes/NumberNode'
 import { RangeNode } from '../nodes/custom/RangeNode'
+import { ResourceNode } from '../nodes/custom/ResourceNode'
 
 const EntityCollection = ['sheep', 'pig']
 
 const predicateTree = new RootNode('predicate', {
   condition: new EnumNode(['foo', 'bar'], {
+    default: () => 'bar',
     transform: (s: string) => (s === 'foo') ? {test: 'baz'} : s
   }),
   number: new NumberNode({integer: false, min: 0}),
   range: new RangeNode(),
   predicate: new ObjectNode({
     type: new EnumNode(EntityCollection),
-    nbt: new StringNode(),
+    nbt: new ResourceNode({
+      default: (v) => "hahaha"
+    }),
     test: new BooleanNode(),
     recipes: new MapNode(
       new StringNode(),
diff --git a/src/nodes/AbstractNode.ts b/src/nodes/AbstractNode.ts
index 1b582eeb..8623a11c 100644
--- a/src/nodes/AbstractNode.ts
+++ b/src/nodes/AbstractNode.ts
@@ -2,9 +2,6 @@ import { DataModel } from "../model/DataModel"
 import { Path } from "../model/Path"
 import { TreeView } from "../view/TreeView"
 
-export type IDefault<T> = (value?: T) => T | undefined
-export type ITransform<T> = (value: T) => any
-
 export interface INode<T> {
   setParent: (parent: INode<any>) => void
   default: IDefault<T>
@@ -26,9 +23,12 @@ export type NodeChildren = {
   [name: string]: INode<any>
 }
 
+export type IDefault<T> = (value?: T) => T | undefined
+export type ITransform<T> = (value: T) => any
+
 export interface NodeMods<T> {
   default?: IDefault<T>
-  transform?: (value: T) => any
+  transform?: ITransform<T>
 }
 
 export abstract class AbstractNode<T> implements INode<T> {
@@ -36,11 +36,9 @@ export abstract class AbstractNode<T> implements INode<T> {
   defaultMod: IDefault<T>
   transformMod: ITransform<T>
 
-  constructor(mods?: NodeMods<T>, defaultMods?: NodeMods<T>, ) {
-    this.defaultMod = mods?.default ? mods.default :
-      defaultMods?.default ? defaultMods.default : (v) => v
-    this.transformMod = mods?.transform ? mods.transform :
-      defaultMods?.transform ? defaultMods.transform : (v) => v
+  constructor(mods?: NodeMods<T>) {
+    this.defaultMod = mods?.default ? mods.default : (v) => v
+    this.transformMod = mods?.transform ? mods.transform : (v) => v
   }
 
   setParent(parent: INode<any>) {
diff --git a/src/nodes/BooleanNode.ts b/src/nodes/BooleanNode.ts
index d8d4a767..3a770f35 100644
--- a/src/nodes/BooleanNode.ts
+++ b/src/nodes/BooleanNode.ts
@@ -3,16 +3,16 @@ import { Path } from "../model/Path";
 import { TreeView } from "../view/TreeView";
 
 export interface BooleanNodeMods extends NodeMods<boolean> {
-  force: boolean
+  force?: boolean
 }
 
 export class BooleanNode extends AbstractNode<boolean> {
   force: boolean
 
   constructor(mods?: BooleanNodeMods) {
-    super(mods, {
-      default: () => false
-    })
+    super({
+      default: () => false,
+      ...mods})
     this.force = (mods?.force === true)
   }
 
diff --git a/src/nodes/EnumNode.ts b/src/nodes/EnumNode.ts
index bc16e65e..310fb85a 100644
--- a/src/nodes/EnumNode.ts
+++ b/src/nodes/EnumNode.ts
@@ -6,8 +6,8 @@ import { Path } from '../model/Path'
 export class EnumNode extends AbstractNode<string> implements StateNode<string> {
   protected options: string[]
 
-  constructor(options: string[], mods?: NodeMods<string>) {
-    super(mods)
+  constructor(options: string[], mods?: NodeMods<string> | string) {
+    super(typeof mods === 'string' ? {default: () => mods} : mods)
     this.options = options
   }
 
diff --git a/src/nodes/ListNode.ts b/src/nodes/ListNode.ts
index 99bf6b34..d38b0067 100644
--- a/src/nodes/ListNode.ts
+++ b/src/nodes/ListNode.ts
@@ -8,9 +8,9 @@ export class ListNode extends AbstractNode<IObject[]> {
   protected children: INode<any>
 
   constructor(values: INode<any>, mods?: NodeMods<IObject[]>) {
-    super(mods, {
-      default: () => []
-    })
+    super({
+      default: () => [],
+      ...mods})
     this.children = values
   }
 
diff --git a/src/nodes/MapNode.ts b/src/nodes/MapNode.ts
index 8c6b5394..8b0b20d4 100644
--- a/src/nodes/MapNode.ts
+++ b/src/nodes/MapNode.ts
@@ -12,9 +12,9 @@ export class MapNode extends AbstractNode<IMap> {
   protected values: INode<any>
 
   constructor(keys: StateNode<string>, values: INode<any>, mods?: NodeMods<IMap>) {
-    super(mods, {
-      default: () => ({})
-    })
+    super({
+      default: () => ({}),
+      ...mods})
     this.keys = keys
     this.values = values
   }
diff --git a/src/nodes/NumberNode.ts b/src/nodes/NumberNode.ts
index fdede5a5..fd2d2dd0 100644
--- a/src/nodes/NumberNode.ts
+++ b/src/nodes/NumberNode.ts
@@ -15,9 +15,9 @@ export class NumberNode extends AbstractNode<number> implements StateNode<number
   max: number
 
   constructor(mods?: NumberNodeMods) {
-    super(mods, {
-      default: () => 0
-    })
+    super({
+      default: () => 0,
+      ...mods})
     this.integer = mods?.integer ? mods.integer : false
     this.min = mods?.min !== undefined ? mods.min : -Infinity
     this.max = mods?.max !== undefined ? mods.max : Infinity
diff --git a/src/nodes/ObjectNode.ts b/src/nodes/ObjectNode.ts
index 651280f6..cc423d97 100644
--- a/src/nodes/ObjectNode.ts
+++ b/src/nodes/ObjectNode.ts
@@ -10,9 +10,9 @@ export class ObjectNode extends AbstractNode<IObject> {
   protected fields: NodeChildren
 
   constructor(fields: NodeChildren, mods?: NodeMods<IObject>) {
-    super(mods, {
-      default: () => ({})
-    })
+    super({
+      default: () => ({}),
+      ...mods})
     this.fields = fields
     Object.values(fields).forEach(child => {
       child.setParent(this)
diff --git a/src/nodes/StringNode.ts b/src/nodes/StringNode.ts
index 7406080e..614605a1 100644
--- a/src/nodes/StringNode.ts
+++ b/src/nodes/StringNode.ts
@@ -3,9 +3,16 @@ import { Path } from '../model/Path'
 import { DataModel } from '../model/DataModel'
 import { TreeView } from '../view/TreeView'
 
+export interface StringNodeMods extends NodeMods<string> {
+  allowEmpty?: boolean
+}
+
 export class StringNode extends AbstractNode<string> implements StateNode<string> {
-  constructor(mods?: NodeMods<string>) {
+  allowEmpty: boolean
+
+  constructor(mods?: StringNodeMods) {
     super(mods)
+    this.allowEmpty = (mods?.allowEmpty === true)
   }
 
   getState(el: Element) {
@@ -13,7 +20,8 @@ export class StringNode extends AbstractNode<string> implements StateNode<string
   }
 
   updateModel(el: Element, path: Path, model: DataModel) {
-    model.set(path, this.getState(el))
+    const value = this.getState(el)
+    model.set(path, this.allowEmpty || value !== '' ? value : undefined)
   }
 
   renderRaw(path: Path, value: string, view: TreeView, options?: RenderOptions) {
diff --git a/src/nodes/custom/ResourceNode.ts b/src/nodes/custom/ResourceNode.ts
new file mode 100644
index 00000000..3cf891cf
--- /dev/null
+++ b/src/nodes/custom/ResourceNode.ts
@@ -0,0 +1,12 @@
+import { NodeMods, RenderOptions } from '../AbstractNode'
+import { StringNode } from '../StringNode'
+
+export class ResourceNode extends StringNode {
+  constructor(mods?: NodeMods<string>) {
+    super({
+      transform: (v) => {
+        if (v === undefined) return undefined
+        return v.startsWith('minecraft:') ? v : 'minecraft:' + v
+      }, ...mods})
+  }
+}