XQuery/Web XML Viewer
< XQuery
Motivation[edit | edit source]
You want to view XML documents using your web browser using HTML markup.
Method[edit | edit source]
We will use an XQuery function that uses the dispatch pattern and the typeswitch function.
Sample Input[edit | edit source]
<aaa a1="A1" a2="A2" a3="A3">
<bbb b1="B1" b2="B2" b3="B3">BBB</bbb>
<ccc c1="C1" c2="C2" c3="C3">
<ddd d1="D1" d2="D2" d3="D3">DDD</ddd>
<eee>
<fff>FFF</fff>
</eee>
</ccc>
</aaa>
Sample XML to HMTL Function[edit | edit source]
(: sequence dispatcher :)
declare function xml-to-html:dispatch($input as node()*, $depth as xs:integer) as item()* {
let $left-margin := concat('margin-left: ', ($depth * 5), 'px' )
for $node in $input
return
typeswitch($node)
case text() return normalize-space(<span class="d">{$node}</span>)
case element()
return
<div class="element" style="{$left-margin}">
<span class="t"><{name($node)}</span>
{ (: for each attribute create two spans for the name and value :)
for $att in $node/@*
return
(
<span class="an"> {name($att)}=</span>,
<span class="av">"{string($att)}"</span>
)
}
{normalize-space(<span class="t">></span>)}
{ (: now get the sub elements :)
for $c in $node
return xml-to-html:dispatch($c/node(), $depth + 1)
}
<span class="t"></{name($node)}></span>
</div>
(: otherwise pass it through. Used for comments, and PIs :)
default return $node
};
Sample Driver[edit | edit source]
xquery version "1.0";
import module namespace xml-to-html="http://example.com/xml-to-html" at "xml-to-html.xqm";
let $title := 'View XML as HTML'
let $input :=
<aaa a1="A1" a2="A2" a3="A3">
<bbb b1="B1" b2="B2" b3="B3">BBB</bbb>
<ccc c1="C1" c2="C2" c3="C3">
<ddd d1="D1" d2="D2" d3="D3">DDD</ddd>
<eee>
<fff>FFF</fff>
</eee>
</ccc>
</aaa>
let $output := xml-to-html:xml-to-html($input, 1)
return
<html>
<head>
<title>{$title}</title>
<link type="text/css" rel="stylesheet" href="syntax-colors-oxygen.css"/>
</head>
<body>
<div class="xml">
{$output}
</div>
</body>
</html>
Sample Output[edit | edit source]
<div class="xml">
<div class="element" style="margin-left: 5px">
<span class="t"><aaa</span>
<span class="an">a1=</span>
<span class="av">"A1"</span>
<span class="an">a2=</span>
<span class="av">"A2"</span>
<span class="an">a3=</span>
<span class="av">"A3"</span>><div class="element" style="margin-left: 10px">
<span class="t"><bbb</span>
<span class="an">b1=</span>
<span class="av">"B1"</span>
<span class="an">b2=</span>
<span class="av">"B2"</span>
<span class="an">b3=</span>
<span class="av">"B3"</span>>BBB<span class="t"></bbb></span>
</div>
<div class="element" style="margin-left: 10px">
<span class="t"><ccc</span>
<span class="an">c1=</span>
<span class="av">"C1"</span>
<span class="an">c2=</span>
<span class="av">"C2"</span>
<span class="an">c3=</span>
<span class="av">"C3"</span>><div class="element" style="margin-left: 15px">
<span class="t"><ddd</span>
<span class="an">d1=</span>
<span class="av">"D1"</span>
<span class="an">d2=</span>
<span class="av">"D2"</span>
<span class="an">d3=</span>
<span class="av">"D3"</span>>DDD<span class="t"></ddd></span>
</div>
<div class="element" style="margin-left: 15px">
<span class="t"><eee</span>><div class="element" style="margin-left: 20px">
<span class="t"><fff</span>>FFF<span class="t"></fff></span>
</div>
<span class="t"></eee></span>
</div>
<span class="t"></ccc></span>
</div>
<span class="t"></aaa></span>
</div>
</div>
Sample CSS File[edit | edit source]
File: syntax-colors-oxygen.css
/* Begin and end tag Delimiter */
.t {color: blue;}
/* Attribute Name and equal sign */
.an {color: orange;}
/* Attribute Values and equal sign */
.av {color: orange;}
/* Element Data Content */
.d {color: black;}
Screen Image[edit | edit source]
