Assumes data pointed by given parameter is an anvil template and formats and outputs it accordingly. If optional handler is given it may contain any number of predefined callbacks, which should output representation of element they reflect.

• onCharacters(line, column, cdata) - called on character data
• onHtmlComment(line, column, cdata) - called on HTML comment
• onProcessingInstruction(line, column, cdata) - called on processing instruction
• onTagStart(line, column, tagname) - called on start of tag
• onTagEnd(line, column, hasEndSlash) - called on end of tag
• onAttribute(line, column, attrName, attrValue) - called on tag attribute

Handler may be:

• class instance, returning functions or method delegates
• scope of functions (module, namespace, class, interface)
• array of functions or delegates