%ref-types;
Default Type of Cross(x)-Reference
Remarks
The values may be used to control type-specific processing or validation.
Model
<!ENTITY % ref-types "aff | app | author-notes | bibr | boxed-text | chem | collab | contrib | corresp | disp-formula | fig | fn | kwd | list | plate | scheme | sec | statement | supplementary-material | table | table-fn | other" >