Client structure:ObjectStructure visitor1:Visitor visitor2:Visitor walk1() walk2() ObjectStructure walk1() { for(Element element: structure) { element.accept(visitor1); } } Visitor visit() visit() <<interface>> ConcreteVisitor1 visit() visit() ConcreteVisitor2 visit() visit() visit(ConcreteElementA a) { a.operation(); } visit(ConcreteElementB b) { b.operation(); } Element accept() <<interface>> ConcreteElementB accept() operation() ConcreteElementA accept() operation() accept(Visitor v) { v.visit(this); } <<import>> <<import>> X <?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"> <!-- Creator: CorelDRAW --> <svg xmlns="http://www.w3.org/2000/svg" xmlns:odm="http://product.corel.com/CGS/11/cddns/" xml:space="preserve" width="8.26772in" height="11.6929in" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd" viewBox="0 0 8268 11692"> <defs> <font id="FontID0" fullFontName="Century Schoolbook" fontVariant="normal" fontWeight="700"> <font-face font-family="Century Schoolbook"> </font-face> <missing-glyph><path d="M0 0z"/></missing-glyph> <glyph unicode="C" horiz-adv-x="777"><path d="M618 669l32 69 38 0 13 -288 -45 0c-14,83 -40,144 -80,184 -38,43 -83,62 -134,62 -53,0 -98,-27 -136,-78 -34,-53 -53,-136 -53,-248 0,-117 21,-205 59,-264 32,-45 80,-66 141,-66 61,0 112,21 155,66 29,32 50,83 64,147l42 0c-10,-83 -40,-149 -93,-197 -53,-46 -117,-72 -195,-72 -98,0 -181,37 -248,106 -66,70 -98,160 -98,267 0,123 37,219 114,291 67,61 142,93 232,93 35,0 67,-5 96,-16 30,-11 62,-29 96,-56z"/></glyph> </font> <style type="text/css"> <![CDATA[ @font-face { font-family:"Century Schoolbook";src:url("#FontID0") format(svg)} .fil0 {fill:#6DBA32} .fil1 {fill:#FFFFFF} .fnt0 {font-weight:bold;font-size:375;font-family:'Century Schoolbook'} ]]> </style> </defs> <g id="Ebene 1"> <circle class="fil0" cx="4358" cy="4880" r="197"/> <text x="4200" y="5016" class="fil1 fnt0">C</text> </g> </svg> <?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"> <!-- Creator: CorelDRAW --> <svg xmlns="http://www.w3.org/2000/svg" xmlns:odm="http://product.corel.com/CGS/11/cddns/" xml:space="preserve" width="8.26772in" height="11.6929in" style="shape-rendering:geometricPrecision; 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