5.6. Cross references

Cross-references work in exactly the same way as usually in LyX: you first insert a label (choosing Insert-->Label from the menu), then insert a cross-reference at a point of your choice (choosing Insert-->Cross-reference from the menu). BUT: You can't cross-reference anything! Although it is certainly possible in LyX, it will not work when exported to SGML: you will get the error

xref to ANCHOR unsupported

See Chapter 6 for a discussion of this error. For the moment, just remember that the only cross-references that work for our purposes are cross-references to

• chapters, sections, subsections, subsubsections

• figures

• tables

but that's quite enough for cross-referencing.

	Always set labels!
	Labels of chapters and sections will become the HTML filenames of the files that contain them. Choose them wisely and make it a habit to always create a label for your new chapter and section as soon as you write down their titles! See Section 5.15 for more tips on this important issue.