Re: About computer-optimized RDF format.

>  A
> typical XML DOM library uses 5 times as much memory as the size of the XML
> data read in.

Concerning that statement:
For many years, "persistent DOM" implementations have proposed a
clever binary file structure backuped by memory indexes that sticks to
DOM API. This architecture helps infinitely when you deal with huge
XML files.

The fact that these binary DOMs are not of common usage is probably
only the lack of a (open and standard) reference implementation.

PS: please note the semantic difference between binary XML and binary
DOM. A binary DOM requires as few parsing, mapping or translation as
possible to be immediately usable by the library.