Assume that you want to write the contents of a dataset to xml, in order to send that data via e-mail or any other means. Have you noticed how verbose xml files are? However, if you try to compress one, you will notice that size of the compressed file is only a small fragment of the original! Just for testing, I compressed an 200MB XML file into a zip file, to see that the resulting file was 9MB only! So, is it possible to write the contents of a dataset into an xml but include that xml directly into a zip file,
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