collect.xref.targets — Controls whether cross reference data is collected
In order to resolve olinks efficiently, the stylesheets can generate an external data file containing information about all potential cross reference endpoints in a document. This parameter determines whether the collection process is run when the document is processed by the stylesheet. The default value is no, which means the data file is not generated during processing. The other choices are yes, which means the data file is created and the document is processed for output, and only, which means the data file is created but the document is not processed for output. See also targets.filename.