diff --git a/src/transforms/normalize.js b/src/transforms/normalize.js
index 978e1ad33..4547dbdba 100644
--- a/src/transforms/normalize.js
+++ b/src/transforms/normalize.js
@@ -1,113 +1,4 @@
 
-/**
- * Only allow block nodes in documents.
- *
- * @type {Object}
- */
-
-const DOCUMENT_CHILDREN_RULE = {
-  match: (node) => {
-    return node.kind == 'document'
-  },
-  validate: (document) => {
-    const { nodes } = document
-    const invalids = nodes.filter(n => n.kind != 'block')
-    return invalids.size ? invalids : null
-  },
-  normalize: (transform, document, invalids) => {
-    return invalids.reduce((t, n) => t.removeNodeByKey(n.key), transform)
-  }
-}
-
-/**
- * Only allow block, inline and text nodes in blocks.
- *
- * @type {Object}
- */
-
-const BLOCK_CHILDREN_RULE = {
-  match: (node) => {
-    return node.kind == 'block'
-  },
-  validate: (block) => {
-    const { nodes } = block
-    const invalids = nodes.filter(n => n.kind != 'block' && n.kind != 'inline' && n.kind != 'text')
-    return invalids.size ? invalids : null
-  },
-  normalize: (transform, block, invalids) => {
-    return invalids.reduce((t, n) => t.removeNodeByKey(n.key), transform)
-  }
-}
-
-/**
- * Only allow inline and text nodes in inlines.
- *
- * @type {Object}
- */
-
-const INLINE_CHILDREN_RULE = {
-  match: (object) => {
-    return object.kind == 'inline'
-  },
-  validate: (inline) => {
-    const { nodes } = inline
-    const invalids = nodes.filter(n => n.kind != 'inline' && n.kind != 'text')
-    return invalids.size ? invalids : null
-  },
-  normalize: (transform, inline, invalids) => {
-    return invalids.reduce((t, n) => t.removeNodeByKey(n.key), transform)
-  }
-}
-
-/**
- * The default schema.
- *
- * @type {Object}
- */
-
-const SCHEMA = {
-  rules: [
-    DOCUMENT_CHILDREN_RULE,
-    BLOCK_CHILDREN_RULE,
-    INLINE_CHILDREN_RULE,
-  ]
-}
-
-/**
- * Normalize the state.
- *
- * @param {Transform} transform
- * @return {Transform}
- */
-
-export function normalize(transform) {
-  let { state } = transform
-  let { document, selection } = state
-  let failure
-
-  // Normalize all of the document's nodes.
-  document.filterDescendantsDeep((node) => {
-    if (failure = node.validate(SCHEMA)) {
-      const { value, rule } = failure
-      rule.normalize(transform, node, value)
-    }
-  })
-
-  // Normalize the document itself.
-  if (failure = document.validate(SCHEMA)) {
-    const { value, rule } = failure
-    rule.normalize(transform, document, value)
-  }
-
-  // Normalize the selection.
-  // TODO: turn this into schema rules.
-  state = transform.state
-  document = state.document
-  let nextSelection = selection.normalize(document)
-  if (!selection.equals(nextSelection)) transform.setSelection(selection)
-  return transform
-}
-
 /**
  * Normalize the document.
  *