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xml-namespaces.html
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<title>Ballerina by Example: XML Namespaces</title>
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<div class="highlight"><pre><span class="nx">xmlns</span> <span class="s">"http://ballerina.com/aa"</span> <span class="k">as</span> <span class="nx">ns0</span><span class="p">;</span><span class="kd">function</span> <span class="nx">main</span> <span class="p">(</span><span class="kt">string</span><span class="p">[]</span> <span class="nx">args</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">xmlns</span> <span class="s">"http://ballerina.com/bb"</span> <span class="k">as</span> <span class="nx">ns1</span><span class="p">;</span>
<span class="nx">xmlns</span> <span class="s">"http://ballerina.com/default"</span><span class="p">;</span>
<span class="nb">println</span><span class="p">(</span><span class="nx">ns0</span><span class="p">:</span><span class="nx">foo</span><span class="p">);</span>
<span class="nx">xmlns</span> <span class="s">"http://ballerina.com/updated"</span> <span class="k">as</span> <span class="nx">ns0</span><span class="p">;</span>
<span class="nb">println</span><span class="p">(</span><span class="nx">ns0</span><span class="p">:</span><span class="nx">foo</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="example" id="xml-namespaces">
<div class="col-xs-11 col-sm-11 col-md-11">
<h2><a href="./">Ballerina by Example</a>: XML Namespaces</h2>
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<p>Ballerina has built-in support for defining and using XML namespaces.</p>
</td>
<td class="code leading">
<div class="highlight"><pre><span class="nx">xmlns</span> <span class="s">"http://ballerina.com/aa"</span> <span class="k">as</span> <span class="nx">ns0</span><span class="p">;</span>
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<div class="highlight"><pre><span class="kd">function</span> <span class="nx">main</span> <span class="p">(</span><span class="kt">string</span><span class="p">[]</span> <span class="nx">args</span><span class="p">)</span> <span class="p">{</span>
</pre></div>
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<p>Namespaces can be declared at package levels as well as at function level. The identifier followed by the ‘as’ keyword is the prefix bound to this namespace name.</p>
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<div class="highlight"><pre> <span class="nx">xmlns</span> <span class="s">"http://ballerina.com/bb"</span> <span class="k">as</span> <span class="nx">ns1</span><span class="p">;</span>
</pre></div>
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<p>Namespace declaration without the prefix. This will define a default namespace.</p>
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<div class="highlight"><pre> <span class="nx">xmlns</span> <span class="s">"http://ballerina.com/default"</span><span class="p">;</span>
</pre></div>
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<p>Namespaces can be used for XML qualified names.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nb">println</span><span class="p">(</span><span class="nx">ns0</span><span class="p">:</span><span class="nx">foo</span><span class="p">);</span>
</pre></div>
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<p>Package level namespaces can be overridden at function level.</p>
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<div class="highlight"><pre> <span class="nx">xmlns</span> <span class="s">"http://ballerina.com/updated"</span> <span class="k">as</span> <span class="nx">ns0</span><span class="p">;</span>
<span class="nb">println</span><span class="p">(</span><span class="nx">ns0</span><span class="p">:</span><span class="nx">foo</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
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<td class="code">
<div class="highlight"><pre><span class="gp">$</span> ballerina run xml-namespaces.bal
<span class="go">{http://ballerina.com/aa}foo</span>
<span class="go">{http://ballerina.com/updated}foo</span>
</pre></div>
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<p class="next">
Next example: <a href="xml-literal">XML Literal</a>.
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by <a href="https://twitter.com/ballerinalang">@ballerinalang</a> | <a href="mailto:ballerina-dev@googlegroups.com">feedback</a> | <a href="https://github.com/ballerinalang/ballerina/tree/master/samples/ballerina-by-example/examples/xml-namespaces">source</a>
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