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    <p>The short answer is no, it's not possible to achieve this reliably with Xalan.</p> <p><strong>EDIT</strong>: However, it might be possible with extensions to Saxon - have a look at them.</p> <p>As for the longer answer, the streaming capabilities of XSLT processors have seen some progress, but the results seem to be too unpredictable yet. For example, see this link: <a href="http://www.balisage.net/Proceedings/vol5/html/Kay01/BalisageVol5-Kay01.html" rel="nofollow noreferrer">http://www.balisage.net/Proceedings/vol5/html/Kay01/BalisageVol5-Kay01.html</a> for a discussion of an attempt to implement Streaming in Saxon.</p> <p>It is assumed that the XSLT 3.0 Recommendation will embrace this question:</p> <blockquote> <p>The primary purpose of the changes in this version of the language is to enable transformations to be performed in streaming mode, where neither the source document nor the result document is ever held in memory in its entirety.</p> </blockquote> <p>See <a href="http://www.w3.org/TR/xslt-30/" rel="nofollow noreferrer">http://www.w3.org/TR/xslt-30/</a> for more information on this. This is only a working draft, though.</p> <p><strong>EDIT</strong>: For streaming with Xalan in particular, Michael Kay writes:</p> <blockquote> <p>Incremental transformation in Xalan doesn't actually stop it building the whole source document as a tree in memory; all it does is to allow the tree to be built in parallel with the transformation process. If you want a streaming transformation, Saxon-EE is your only practical option. [...]</p> </blockquote> <p>This is taken from <a href="https://stackoverflow.com/questions/10880608/incremental-streaming-xslt-transformations">Incremental/streaming XSLT transformations?</a> , dating from 2012. Seems like <code>StreamSource</code> is not streaming, really.</p>
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    1. COThank you for your reply. Quick question, then what is the purpose ofnew StreamSource(in), new StreamResult(out)? Sorry I am new to XSLT. I thought StreamSource(in) means XML can be streamed i.e. generated tag by tag, no? I was assuming StreamResult(out) would do similar i.e. stream the HTML output as it is available? What does "incremental transform" in Xalan achieve? I would appreciate your response.
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    2. COSee my edited answer on this.
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    3. COUnderstood, so if I am reading it correctly until XML is generated the output or result HTML can not be written to the browser, correct? I was impression that if one tag out of whole xml is complete the transformation can beging and StreamResult(out) can start writing response to the browser, so I was mistake and I guess that is Saxon-EE? I would appreciate your advise.
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