Hi Folks, I have an XML Schema with a simpleType that enumerates its values. The enumeration values are long; for example, here is one value: <xs:enumeration value="end coordinates of the starting point and ending point" /> I wrote an XSLT program that generates a schema-conformant instance document. Before validation I clicked on the Format/Indent button to get the instance document nicely formatted. Then I clicked on the Associate Schema button. Then I clicked on the Validate button. Validation failed! When I checked to see what failed, I saw this: <shapeIsDefinedBy>end coordinates of the starting point and ending point</shapeIsDefinedBy> Yikes! The formatting/indenting tool split the enumeration value across lines, which created an invalid enumeration value. Here's the trick I learned: 1. Load the instance document into Oxygen XML 2. Click on the Associate Schema button 3. Click on the Format/Indent button 4. Click on the Validate button Do it in that order! The key is to Associate Schema first and then Format/Indent. When you associate a schema first, then the Oxygen format/indent tool knows that it shouldn't split enumeration values across lines. /Roger