FAQ ABOUT W3C WEB SITE

W3C is most likely blocking your IP because of excessive traffic; often this is due to requesting the same resource from us repeatedly (e.g. a DTD, Schema, Entity, or Namespace document.) We give extensive caching directives and there really is no reason to request the same resource over and over when it is not going to change. Your XML library or utility probably has a means to use a XML catalog and/or have a caching mechanism; please consult that documentation on how to utilize such features. If there are no such options you should contact the party responsible for the library or utility used. You may also put a caching proxy between your application server and the internet..

Yes. Due to various software systems downloading DTDs from our site millions of times a day (despite the caching directives of our servers), we have started to serve DTDs and schema (DTD, XSD, ENT, MOD, etc.) from our site with an artificial delay. Our goals in doing so are to bring more attention to our ongoing issues with excessive DTD traffic, and to protect the stability and response time of the rest of our site. We recommend HTTP caching or catalog files to improve performance.

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No. Each specification includes links to useful resources (such as DTDs and schemas) for that specification. A search engine should also be helpful in finding a particular DTD or Schema.

Maybe. W3C does not endorse any particular software. However, because it is useful to provide links to software that implements a specification, we often link to multiple products or services (thus: many, not one). At the bottom of each page you will find contact information for the person responsible for updating links on that page.