Names graphical or other image-related elements in the base DTD Suite that cannot be used inline, but only as block elements; the display elements may occur within the text of a table cell or paragraph although they are typically at the same hierarchical level as a paragraph.
<!ENTITY % block-display.class "array | boxed-text | chem-struct | chem-struct-wrapper | fig | fig-group | graphic | map-group | media | preformat | supplementary-material | table-wrap | table-wrap-group" >
bookcustom-classes.ent