Good morning hyposmurf
just read your topic and thought it very interesting. i work in the oil business mapping the pipelines under the north sea mainly and we chart all these areas to see if anything has happened to the pipe. as you can probably tell at a decent scale we get throught maybe 20-30 charts per pipe. so in doing so i use xrefs constantly. i usually get the legend of the chart set up, ok'd by the boss and then xref it in everytime. saves time and effort i can tell you. then as the charts are generated for the final time after corrections made i then at the last minute bind my xrefs so the office back home has one drawing. i keep the original xref's and charts in my files but send the bound ones back to the uk/norway.
bizarre thing happened the other day though for the first time. went to bind followed everything down to the letter and then ok'd it but then found the drawing still as an xref. in the end to cut a long story short i copied everything that was an xref and copybase'd it in. no clue at all why this happened. any clue cheers