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%xref-elements; X(Cross) Reference Elements

Elements that can be included along with data characters inside the content model of the <xref> element.
Declaration
<!ENTITY % xref-elements
                        "%link-elements;"                            >
Expanded Declaration

| bold | fixed-case |italic | monospace | overline | roman | sans-serif | sc | strike | underline | ruby | named-content | styled-content | sub | sup