Adding Mark-up to the content-type Resource
Once you have decided on the mark-up to use, you can add it to the
required field definitions in your content-type
resource. For example:
<field name="my-custom-field" type="number"> <my-custom-property-editor xmlns="http://my-company.com/2008/studio-plugin" enabled="true"> <min>2</min> <max>300</max> </my-custom-property-editor> </field>