This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
in the schema, i want to restrict the value of an attribute to a fixed group(somewhat like the <option> tag in html) so the value of the attribute in xml document must fall into this group. or not, the validation will fail. how can i do that?