tocparse - simple cmd line, POC NodeJS based Javascript parser for toc files
-------------------------------------------------------------------------------

xpath and xmldom are used for DOM parsing.

Two elements are expected for a TOC to be parsed properly:

1. at least one nav element
2. <a> tags within a <nav>

The level of the nesting is determined by querying the location of the top 
level <nav> element for any given <a> tag.


To run:  "node tocparse.js path/to/toc/file"
e.g.: "node tocparse.js /Volumes/repositories/some-epub/root/OPS/xhtml/toc.xhtml"

Information about each TOC element is returned in stdout as a block, e.g.:

[*] <a href="pg0006.xhtml">Level Four</a>
    level: 4
    content: Level Four
    href: pg0006.xhtml