source: downloads/Tools/Wings3DExporter/xmlout.py @ 7

# extremely simple XML writer
#
# This is to remove libxml2 dependency on platforms where it's 
# difficult to build
#
# 2003 Attila Tajti <attis@spacehawks.hu>

class XMLDoc:

        def __init__(self, version):
                self.version = version
                self.root_element = None

        def saveFile(self, filename):
                f = file(filename, "w")
                f.write('<?xml version="' + self.version + '"?>\n')
                self.root_element._write(f, 0)

        def saveFormatFile(self, filename, fmt):
                self.saveFile(filename)

        def freeDoc(self):
                pass

class XMLNode:

        def __init__(self, name):
                self.name = name
                self.props = []
                self.children = []
                self.content = None

        def docSetRootElement(self, doc):
                doc.root_element = self
        
        def newChild(self, namespace, name, content):
                if namespace:
                        fullname = namespace + ':' + name
                else:
                        fullname = name
                child = XMLNode(fullname)
                child.content = content
                self.children.append(child)
                return child

        def setProp(self, name, value):
                self.props.append((name, value)) 
        
        def _write(self, f, indent):
                #istr = "  " * indent
                istr = "\t" * indent

                # put together our tag
                tag = self.name
                for prop in self.props:
                        name, value = prop
                        tag += ' ' + name + '="' + value + '"'

                # print tag, or children between tags
                if self.children:
                        f.write(istr + '<%s>\n' % tag)
                        for child in self.children:
                                child._write(f, indent + 1)
                        f.write(istr + '</%s>\n' % self.name)
                else:
                        f.write(istr + '<%s/>\n' % tag)

def newDoc(version):
        return XMLDoc(version)

def newNode(name):
        return XMLNode(name)