The DITA Open Toolkit (DITA-OT) processes the XML map into various formats suitable for the "PC Book":
<bookmap id="pc_hardware_guide"> <booktitle> <mainbooktitle>The Complete PC Hardware Compendium</mainbooktitle> </booktitle> <frontmatter> <booklists> <toc/> </booklists> </frontmatter>
Could it be a typo or shorthand for:
When generating the PDF for an Intel guide, the DITA-OT (Open Toolkit) filters out the AMD command, and vice versa.