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    <p>The answer lies in <strong>XML-DTD/Schema</strong>. The underlying schema so defined in the API results in the error. Though I suppose I donot wish to teach XML here, still a look at the following will make things clear.</p> <p>XML has two points to be considered:</p> <ul> <li><strong>Well Formed XML:</strong> perfect syntax</li> <li><strong>Valid XML:</strong> perfectly valid against a DTD (Document Type Definition) / Schema</li> </ul> <p><strong>Points about DTD:</strong> Suggested DTD upon your question: </p> <pre><code>&lt;!DOCTYPE transaction [ &lt;!ELEMENT address (#PCDATA)&gt; &lt;!ELEMENT amount (#PCDATA)&gt; &lt;!ELEMENT orderid (#PCDATA)&gt; ]&gt; </code></pre> <p>The above is a suggested DTD upon the structure you provided in the question. Since you are dealing with a particular API, it has such type of structure already defined in it. Alternative to this is the <strong>XML schema</strong>.</p> <p><strong>Points about XML Schema:</strong></p> <pre><code>&lt;xs:element name="transaction"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="address" type="xs:string"/&gt; &lt;xs:element name="amount" type="xs:string"/&gt; &lt;xs:element name="orderid" type="xs:string"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; </code></pre> <p>Currently, <strong>XML schema</strong> are used <strong>instead of DTDs</strong> as they are far more superior in defining the data structure for their users and provide an <strong>object-oriented approach</strong>.</p>
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    1. POWhy is node order important in XML?
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    1. CO+1 Could you give an example of how the DTD and schema would be modified in order to make `address`, `amount` and `orderid` valid in any order? Would it be a more complex DTD/schema? If so then this would be one possible reason why the developers have enforced the order...
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    2. COThe answer for the ordering lies in the fact that these files are parsed from TAG to TAG. The concerned application which parses the file, will parse the file in the sequence provided in the schema. Well if you build your custom parser library, you can definitely change the ordering.. just to make the parsing logic more complex!!
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