Inside XML

Creating a Graphical Browser

In Java, text is just a form of graphics, so we've already been working with graphics. In this next example, I'll create a nontext browser that reads an XML document and uses it to draw graphics figures—circles. Here's what a document this browser might read, circles.xml, looks like—I'm specifying the (x, y) origin of the circle and the radius of the circle as attributes of the <CIRCLE> element:

 <?xml version = "1.0" ?> <!DOCTYPE DOCUMENT [ <!ELEMENT DOCUMENT (CIRCLE|ELLIPSE)*> <!ELEMENT CIRCLE EMPTY> <!ELEMENT ELLIPSE EMPTY> <!ATTLIST CIRCLE X CDATA #IMPLIED Y CDATA #IMPLIED RADIUS CDATA #IMPLIED> <!ATTLIST ELLIPSE X CDATA #IMPLIED Y CDATA #IMPLIED WIDTH CDATA #IMPLIED HEIGHT CDATA #IMPLIED> ]> <DOCUMENT> <CIRCLE ...