The Quality of the XML Web
11 Pages Posted: 7 Jul 2018 Publication Status: Accepted
We collect evidence to answer the following question: Is the quality of the XML documents found on the Web sufficient to apply XML technology like XQuery, XPath and XSLT? XML collections from the Web have been previously studied statistically, but no detailed information about the quality of the XML documents on the Web is available to date. We address this shortcoming in this study. We gathered 180K XML documents from the Web. Their quality is surprisingly good; 85.4% is wellformed and 99.5% of all specified encodings is correct. Validity needs serious attention. Only 25% of all files contain a reference to a DTD or XSD, of which just one third is actually valid. Wellformedness errors and validity errors are studied in detail. Our study is well documented, easily repeatable and all data is publicly available . This paves the way for a periodic quality assessment of the XML Web.
Keywords: Standardization, XML, XML Web, Schemas, Data Quality
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