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POHow to resolve an internally-declared XML entity reference using NSXMLParser
 

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  1. POHow to resolve an internally-declared XML entity reference using NSXMLParser
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    <p>I have an XML file that uses internally-declared entities. For example:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; ... &lt;!ENTITY my_symbol "my symbol value"&gt; ... &lt;my_element&gt; &lt;my_next_element&gt;foo&amp;my_symbol;bar&lt;/my_next_element&gt; &lt;/my_element&gt; ... </code></pre> <p>Using the NSXMLParser class, how am I able to resolve the <code>my_symbol</code> entity reference?</p> <p>From experimentation, the <code>parser:foundInternalEntityDeclarationWithName:value:</code> delegate method will be called for the <code>my_symbol</code> entity declaration, with value <code>"my symbol value"</code>. Then, when the <code>my_next_element</code> element is reached, <code>NSXMLParser</code> will call the <code>parser:didStartElement:namespaceURI:qualifiedName:attributes:</code> delegate method.</p> <p>Before <code>parser:didEndElement:namespaceURI:qualifiedName:</code> is called for <code>&lt;/my_next_element&gt;</code>, the <code>parser:foundCharacters:</code> delegate method will be called twice with the strings:</p> <ol> <li><code>"foo"</code></li> <li><code>"bar"</code></li> </ol> <p>The <code>my_symbol</code> entity reference is ignored. What is required in order for the entity reference to be resolved?</p> <p>EDIT:</p> <p>Removing the <code>ENTITY</code> declaration of <code>my_symbol</code> from the DTD will result in an <code>NSXMLParserUndeclaredEntityError</code>. This suggests that when the entity declaration is present, and then referenced in <code>&lt;my_next_element&gt;</code>, it is being noticed. For some reason it's just not being resolved to the string it represents.</p> <p>Also, if <code>&amp;amp;</code> is used within an element, the parser will correctly resolve it to <code>"&amp;"</code> and this is passed as the string when the <code>parser:foundCharacters:</code> delegate method is called.</p>
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      1. POHow to resolve an internally-declared XML entity reference using NSXMLParser
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    1. COcan you find it with [XPath](http://en.wikipedia.org/wiki/XPath)?
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    2. COI performed an XPath query on 'my_element' and both "foo" and "bar" were not resolved either. Is it correct to reference internally-declared entities as I have done?
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    3. COto be honest, I don't know if it's correct or not, but it is certainly unconventional. I'm not 100% clear on why you don't just make 2 child entities, "foo" and "bar". Then you could use XPath.
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