Format Layer
XSL-FO
 keep-together
XSL-FO Formatting Properties to keep rendering blocks on the same page or within the same column.
Presentation Blocks
Presentation elements that belong together. They only make sense together.
http://www.w3.org/TR/2001/REC-xsl-20011015/Overview.html#contents

Extensible Stylesheet Language (XSL) - Formating Objects (FO) to render page oriented formats.

/livcos.org/LivCos/data/map/Architecture