When you validate an XML document, XML Spy first tries to locate any reference to a supported schema dialect within the document. It then loads the corresponding schema or DTD into memory, and uses its definitions to validate your XML instance document.
Once the Schema or DTD has been loaded into memory, XML Spy also provides you with intelligent editing functions in the Info Window and Entry-Helpers.
As long as the XML instance document is open, XML Spy will also keep the Schema or DTD in memory (see the Flush Memory Cache command on the DTD/Schema menu).
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