... exercises.To access the site, visit www.wiley.com/compbooks/60minutesaday.About the 60 Minutes Web SiteAPPENDIX a4 22541 AppA.qxd 6/19/03 10: 14 AM Page 655 Index 665datasrc attribute, 385–387HTML tables ... metadatato learn about the subject matter in Web resources. Semantics, aswe use it here, has a narrower focus: the actual meaning of num-bers, constants, variables, and operators in the mathematicalexpressions ... images. It is recommendedthat an alttext attribute always be provided, so thatan end user can at least get some informationdespite a MathML malfunction.When providing values for any MathMLattributes,...