Open up a command prompt, and change directories to the workbook's root directory.
Transform MARCXML data into sets of MODS files: xsltproc xslt/marcxml2mods.xsl xml- data/marcxml/single/catalog.xml .
Open up the directory xml-data/mods/many/ and browse its contents. You should see sets of MODS files. These files will be fodder for later exercises.