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