Collapse Text: -oxy-collapse-text Property Value
Used to collapse the content of an element.
Oxygen XML Author Eclipse plugin allows you to set the value of the visibility
      property to -oxy-collapse-text, meaning that the content of that element is
      not rendered. If an element is marked as -oxy-collapse-text you are not able
      to position the cursor inside it and edit it. The purpose of
        -oxy-collapse-text is to make the text value of an element editable only
      through a form control.
Example: visibility Property
The text value of an XML element will be edited using a text field form control. In this
      case, the text content is not directly present in the Author visual
      editing
      mode:
  title{
 content: oxy_textfield(edit, '#text', columns, 40);
 visibility:-oxy-collapse-text;
}