The ISO Z Standard suggests two commonly used styles for rendering Z schemas with boxes. To conform to the standard, the CZT editor plug-in implements the two box rendering style in the Unicode mode of its editor. Here are the sample views of those two styles in the Unicode mode of the editor.

• First box rendering style:

  

• Second box rendering style:

  

The style, line colour and line width of the schema box can be changed in the Annotation preference page.