Question

I came across some xml parsers in some code in Java, I don’t know what the first parameter in the following line represent ?

this.xml.startElement("", "", "root", atts);

I can see that it represents Namespace URI, but what does it mean when using “”, “” ?

Thanks.

Answer 1

It’s stated in the docs. The parameters are:

1. uri – the Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed
2. localName – the local name (without prefix), or the empty string if Namespace processing is not being performed
3. qName – the qualified name (with prefix), or the empty string if qualified names are not available
4. atts – the attributes attached to the element. If there are no attributes, it shall be an empty Attributes object. The value of this object after startElement returns is undefined