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Reference in one place in a book to information at another place in the same work

The term cross reference (abbreviation: xref) can refer to either:
An instance within a document which refers to related information elsewhere in the same document. In both printed and online dictionaries cross references are important because they form a network structure of relations existing between different parts of data, dictionary internal as well as dictionary external. In an index, a cross reference is often denoted by See also. For example, under the term Albert Einstein in the index of a book about Nobel Laureates, there may be the cross reference See also: Einstein, Albert. In hypertext, cross references take the form of "live" references within the text that, when activated by mouse click, touch, voice command or other means, immediately makes available the referenced content, which might be a different part of the same document, or another document entirely. In programming, "cross referencing" means the listing of every file name and line number where a given named identifier occurs within the program's source tree. In a relational database management system, a table can have an xref as prefix or suffix to indicate it is a cross reference table that joins two or more tables together via primary key.

If the cross reference mechanism is well designed, the reader will be able to follow each cross reference to the referenced content whether the content is presented in print or electronically. An author working in a content management system is responsible for identifying subjects of interest that cross documents, and creating appropriate systems of cross references to support readers who seek to understand those subjects. For an individual cross reference, an author should ensure that location and content of the target of the cross reference are clearly identified, and the reader can easily determine how to follow the cross reference in each medium in which publication is supported. Content strategy practitioners (known as content strategists) specialize in planning content to meet business needs, taking into account the processes for creating and maintaining the content, and the systems that support the content.