diff --git a/packages/core/src/Node.ts b/packages/core/src/Node.ts
index 1956478a..4458edbd 100644
--- a/packages/core/src/Node.ts
+++ b/packages/core/src/Node.ts
@@ -71,6 +71,7 @@
 
 import { DOMOutputSpec, NodeSpec, Node } from 'prosemirror-model'
 import { ExtensionSpec } from './Extension'
+import { Attributes } from './types'
 
 export interface NodeExtensionSpec<Options = {}, Commands = {}> extends ExtensionSpec<Options, Commands> {
   topNode?: boolean,
@@ -100,6 +101,11 @@ export interface NodeExtensionSpec<Options = {}, Commands = {}> extends Extensio
       },
     }
   ) => DOMOutputSpec,
+  createAttributes?: (
+    this: {
+      options: Options,
+    },
+  ) => Attributes,
 }
 
 export type NodeExtension = Required<Omit<NodeExtensionSpec, 'defaultOptions'> & {
@@ -127,6 +133,7 @@ const defaultNode: NodeExtension = {
   createCommands: () => ({}),
   parseHTML: () => null,
   renderHTML: () => null,
+  createAttributes: () => ({}),
 }
 
 export function createNode<Options extends {}, Commands extends {}>(config: NodeExtensionSpec<Options, Commands>) {
diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index bc33c59c..f2edacc4 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -1,5 +1,24 @@
-import Extension from './Extension'
-import Node from './Node'
-import Mark from './Mark'
+import { Extension } from './Extension'
+import { NodeExtension } from './Node'
+import { MarkExtension } from './Mark'
 
-export type Extensions = (Extension | Node | Mark)[]
+export type Extensions = (Extension | NodeExtension | MarkExtension)[]
+
+export type Attribute = {
+  default: any,
+  rendered?: boolean,
+  renderHTML?: (attributes: {
+    [key: string]: any,
+  }) => any,
+  parseHTML?: () => any,
+}
+
+export type Attributes = {
+  [key: string]: Attribute
+}
+
+export type ExtensionAttribute = {
+  type: string,
+  name: string,
+  attribute: Attribute
+}
diff --git a/packages/core/src/utils/getAttributesFromExtensions.ts b/packages/core/src/utils/getAttributesFromExtensions.ts
new file mode 100644
index 00000000..6eae27be
--- /dev/null
+++ b/packages/core/src/utils/getAttributesFromExtensions.ts
@@ -0,0 +1,38 @@
+import {
+  Extensions, Attributes, Attribute, ExtensionAttribute,
+} from '../types'
+import splitExtensions from './splitExtensions'
+
+export default function getAttributesFromExtensions(extensions: Extensions) {
+  const allAttributes: ExtensionAttribute[] = []
+
+  const { nodeExtensions } = splitExtensions(extensions)
+
+  const defaultAttribute: Required<Attribute> = {
+    default: null,
+    rendered: true,
+    renderHTML: () => ({}),
+    parseHTML: () => null,
+  }
+
+  nodeExtensions.forEach(extension => {
+    const context = {
+      options: extension.options,
+    }
+
+    const attributes = extension.createAttributes.bind(context)() as Attributes
+
+    Object.entries(attributes).forEach(([name, attribute]) => {
+      allAttributes.push({
+        type: extension.name,
+        name,
+        attribute: {
+          ...defaultAttribute,
+          ...attribute,
+        },
+      })
+    })
+  })
+
+  return allAttributes
+}
diff --git a/packages/core/src/utils/getRenderedAttributes.ts b/packages/core/src/utils/getRenderedAttributes.ts
new file mode 100644
index 00000000..db559c26
--- /dev/null
+++ b/packages/core/src/utils/getRenderedAttributes.ts
@@ -0,0 +1,17 @@
+import { Node } from 'prosemirror-model'
+import { ExtensionAttribute } from '../types'
+
+export default function getRenderedAttributes(node: Node, attributes: ExtensionAttribute[]) {
+  return attributes
+    .map(attribute => {
+      // TODO: fallback if renderHTML doesn’t exist
+      return attribute.attribute.renderHTML(node.attrs)
+    })
+    .reduce((accumulator, value) => {
+      // TODO: add support for "class" merge
+      return {
+        ...accumulator,
+        ...value,
+      }
+    }, {})
+}
diff --git a/packages/core/src/utils/getSchema.ts b/packages/core/src/utils/getSchema.ts
index 3d1f0c9b..0000471c 100644
--- a/packages/core/src/utils/getSchema.ts
+++ b/packages/core/src/utils/getSchema.ts
@@ -5,8 +5,12 @@ import { Extensions } from '../types'
 // import getMarksFromExtensions from './getMarksFromExtensions'
 // import resolveExtensionConfig from './resolveExtensionConfig'
 import splitExtensions from './splitExtensions'
+import getAttributesFromExtensions from './getAttributesFromExtensions'
+import getRenderedAttributes from './getRenderedAttributes'
 
 export default function getSchema(extensions: Extensions): Schema {
+  const allAttributes = getAttributesFromExtensions(extensions)
+
   const { nodeExtensions, markExtensions } = splitExtensions(extensions)
 
   const topNode = nodeExtensions.find(extension => extension.topNode)?.name
@@ -16,9 +20,7 @@ export default function getSchema(extensions: Extensions): Schema {
       options: extension.options,
     }
 
-    const attributes = {
-      class: 'test',
-    }
+    const attributes = allAttributes.filter(attribute => attribute.type === extension.name)
 
     const schema: NodeSpec = {
       content: extension.content,
@@ -32,20 +34,30 @@ export default function getSchema(extensions: Extensions): Schema {
       defining: extension.defining,
       isolating: extension.isolating,
       parseDOM: extension.parseHTML.bind(context)(),
-      toDOM: node => extension.renderHTML.bind(context)({ node, attributes }),
+      toDOM: node => {
+        return extension.renderHTML.bind(context)({
+          node,
+          attributes: getRenderedAttributes(node, attributes),
+        })
+      },
+      attrs: Object.fromEntries(attributes.map(attribute => {
+        return [attribute.name, { default: attribute?.attribute?.default }]
+      })),
     }
 
     return [extension.name, schema]
   }))
 
+  // console.log({ nodes })
+
   const marks = Object.fromEntries(markExtensions.map(extension => {
     const context = {
       options: extension.options,
     }
 
-    const attributes = {
-      class: 'test',
-    }
+    // const attributes = {
+    //   class: 'test',
+    // }
 
     const schema: MarkSpec = {
       inclusive: extension.inclusive,
@@ -53,7 +65,7 @@ export default function getSchema(extensions: Extensions): Schema {
       group: extension.group,
       spanning: extension.spanning,
       parseDOM: extension.parseHTML.bind(context)(),
-      toDOM: node => extension.renderHTML.bind(context)({ node, attributes }),
+      toDOM: node => extension.renderHTML.bind(context)({ node, attributes: {} }),
     }
 
     return [extension.name, schema]
diff --git a/packages/extension-paragraph/index.ts b/packages/extension-paragraph/index.ts
index 6dea2e79..63c6a87e 100644
--- a/packages/extension-paragraph/index.ts
+++ b/packages/extension-paragraph/index.ts
@@ -65,6 +65,15 @@ export default createNode({
 
   content: 'inline*',
 
+  createAttributes() {
+    return {
+      id: {
+        default: '123',
+        renderHTML: attributes => ({ class: `foo-${attributes.id}`, id: 'foo' }),
+      },
+    }
+  },
+
   parseHTML() {
     return [
       { tag: 'p' },