text: /** @jsx jsx */
  
  import { jsx } from 'slate-hyperscript'
  
  export const schema = [
    {
      for: 'node',
      match: { a: true },
      validate: {
        children: [{ max: 1 }],
      },
    },
  ]
  
  export const input = (
    <editor>
      <element a>
        <element b>one</element>
        <element b>two</element>
      </element>
    </editor>
  )
  
  export const output = (
    <editor>
      <element a>
        <element b>one</element>
      </element>
    </editor>
  )
  