If a can appear in formatted code,
the corresponding text should be in a call to substitute_html_non_breaking_space,
to take into account ENABLE_ENCODING and USE_NUMERIC_ENTITY
customization variables:
$substituted_text = $converter->substitute_html_non_breaking_space ($formatted_text) ¶Substitute according to customization variables values.
This is not needed if the non_breaking_space information is taken from
the general information (see Conversion General Information).