Fix a bug causing element having text node child to be considered as
leaf node. Only elements having no children elements should be leaf
nodes.
Change ivy lib path to local.
revert change made to build file
Create new test case for RDF generation from XBRL.
allow creating mapping directly from document
replace deprecated method for writing XML doc
make xml builder namespace-aware
fix indentation in output
add discovery for value property to basic schema extraction
Merge pull request #16 from ekzhu/devel/refactor

Fix a bug causing element having text node child to be considered as leaf node, and add extraction for value property