zstreams-xml-writer

Simple streaming XML writer intended to be paired with zstreams-xml-parser for XML transforms.
It inputs event objects from the XML parser and outputs XML data.

This has the following caveats:

* processinginstruction, sgmldeclaration, opennamespace, and closenamespace events are ignored.
* attribute events are not used. Attributes are taken from the opentag event.
* No validation is performed; events are expected to be in a valid order.

Example (uppercases all text in the document):

``js
var zstreams = require('zstreams');
var XMLParser = require('zstreams-xml-parser');
var XMLWriter = require('zstreams-xml-writer');

zstreams
.fromFile('./example.xml')
.pipe(new XMLParser())
.through(function(event) {
if (event.type === 'text') {
event.args[0] = event.args[0].toUpperCase();
}
return event;
})
.pipe(new XMLWriter())
.pipe(process.stdout);
``