Object oriented style:
class XMLWriter {Procedural style:
bool xmlwriter_write_attribute ( resource xmlwriter, string name, string value )Writes a full attribute.
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
nameThe name of the attribute.
valueThe value of the attribute.