xref.label-title.separator string xref.label-title.separator Punctuation or space separating label from title in xref : This parameter allows you to control the punctuation of certain types of generated cross reference text. When cross reference text is generated for an xref or olink element using an xrefstyle attribute that makes use of the select: feature, and the selected components include both label and title, then the value of this parameter is inserted between label and title in the output.