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POModifying tags of an XML
 

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    <p>I'm looking for the best way to dynamically modify the tags of a very large XML file.</p> <p>Consider the following input XML:</p> <p><strong>Input</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;rootTag&gt; &lt;dictionary&gt; &lt;name&gt;field1&lt;/name&gt; &lt;address&gt;field2&lt;/address&gt; &lt;gender&gt;field3&lt;/gender&gt; . . &lt;postcode&gt;field30&lt;/postcode&gt; &lt;/dictionary&gt; &lt;records&gt; &lt;record&gt; &lt;field id="field1"&gt;John&lt;/field&gt; &lt;field id="field2"&gt;Svalbard&lt;/field&gt; &lt;field id="field3"&gt;M&lt;/field&gt; . . &lt;field id="field30"&gt;12345&lt;/field&gt; &lt;/record&gt; . . &lt;record&gt; . . &lt;/record&gt; &lt;/records&gt; &lt;/rootTag&gt; </code></pre> <p>The XML file contains a dictionary on top and a huge chunk of record nodes, whose tags are linked to the dictionary.</p> <p>I'd like to replace the <strong>tags</strong> within each record node to their corresponding value from the dictionary. Thus, the output should look like:</p> <p><strong>Output</strong></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;rootTag&gt; &lt;records&gt; &lt;record&gt; &lt;name&gt;John&lt;/name&gt; &lt;address&gt;Svalbard&lt;/address&gt; &lt;gender&gt;M&lt;/gender&gt; . . &lt;postcode&gt;12345&lt;/postcode&gt; &lt;/record&gt; . . &lt;record&gt; . . &lt;/record&gt; &lt;/records&gt; &lt;/rootTag&gt; </code></pre> <p>Keeping in mind that there are a tremendously large number of <code>&lt;record&gt;</code> nodes, what's the best way to achieve this transformation in Java?</p> <p>Note that I only want to change the tags and not the attributes.</p>
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    1. COIf you said you wanted to build a bridge over a very wide river, I would expect any competent engineer to ask you how wide is very wide? The answer depends: the solution for 100Mb might be different from the solution for 10Gb.
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    2. COFair point. I'm talking about multiple XML files about 200 MB in size.
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    3. CO200Mb is possible to handle in memory these days, but it's close to the limit, so you probably want to consider streaming techniques if there's a chance it will get any larger.
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