Object oriented style:
class XMLWriter {Procedural style:
bool xmlwriter_start_document ( resource xmlwriter [, string version [, string encoding [, string standalone]]] )Starts a document.
xmlwriter
仅用于过程调用。resource 是被修改的 XMLWriter 资源。此资源来自对 xmlwriter_open_uri() 或 xmlwriter_open_memory() 的调用
version
The version number of the document as part of the XML declaration. Defaults to 1.0.
encoding
The encoding of the document as part of the XML declaration. NULL by default.
standalone
yes or no. NULL by default.