compact small text nodes; no modification of the tree allowed afterward (will possibly crash if you try to modify the tree)
default DTD attributes
load the external subset
validate with the DTD
relax any hardcoded limit from the parser
ignore internal document encoding hint
do not fixup XINCLUDE xml:base uris
remove blank nodes
merge CDATA as text nodes
Do not reuse the context dictionary
substitute entities
suppress error reports
Forbid network access
suppress warning reports
do not generate XINCLUDE START/END nodes
remove redundant namespaces declarations
parse using XML-1.0 before update 5
pedantic error reporting
recover on errors
use the SAX1 interface internally
Implement XInclude substitution
Store big lines numbers in text PSVI field