Every once in a while I get an email about W3C validation.The people emailing me either point me at the fact that my own site doesn’t validate correctly (thank Facebook for most of that), or they ask me whether I think W3C Validation is important.Having hundreds of validation errors is not usually a sign of code quality, so trying to keep the number of errors, hard or soft, down is usually a good idea.Whether you really have to bring it down to zero is another discussion, as over obsessing with certain issues can be a costly thing to do.XML Schema 1.1 Part 2: Datatypes and XML Schema 1.1 Part 1: Structures are available.Please refer to the errata for this document, which may include some normative corrections.We are also planning on adding more features to user accounts in the future, such as more advanced comparison options.
Most of the internet pages are written in HTML and Extensible HTML language.
The previous errata for this document, are also available. This document is also available in these non-normative formats: XML and XHTML with color-coded revision indicators.
Copyright © 2008 The Extensible Markup Language (XML) is a subset of SGML that is completely described in this document.
However, for translations of this document, see Technology? As a consequence, many possible documents which were not well-formed according to previous editions of this specification are now well-formed, and previously invalid documents using the newly-allowed name characters in, for example, ID attributes, are now valid.
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