Questions about XML:LibXML

I am currently migrating several large scripts from XML::DOM to
XML::LIBXML and the transistion has hightligted a number of problems.
Both modules have rather poorly documented aspects and the move to
XML::LIBXML is proving painful.

A typical use of either module to read XML goes along the lines of

my $parser =XML::LibXML->new();
my $tree = $parser->parse_file($metafile);

XML::LIBXML seems to require an extra step of

my $pubmeta = $tree->getDocumentElement();

I think my misunderstandings starts at the very first line.
- What this $parser object do? If I am parsing multiple files
do I need a seperate parser instance for each file?

- Having used parse_file() within a subroutine do I need to
keep it around or is it just $tree that needs kept?

- Or can I get away with just keeping $pubmeta in scope?

In answering or commenting on the above bear in mind that I am
opening lots of XML files, merging elements from them into a master.

Thanks in advance Fergus.
.

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