A JSP document is a JSP page written in XML syntax as opposed to the standard syntax JSP Page. Because it is written in XML syntax, a JSP document is also an XML document and therefore gives you all the benefits offered by the XML standard:
You can author a JSP document using one of the many XML-aware tools on the market, enabling you to ensure that your JSP document is well-formed XML. You can validate the JSP document against a document type definition (DTD). You can nest and scope namespaces within a JSP document. You can use a JSP document for data interchange between web applications and as part of a compile-time XML pipeline.
In addition to these benefits, the XML syntax gives the JSP page author less complexity and more flexibility. For example, a page author can use any XML document as a JSP document. Also, elements in XML syntax can be used in JSP pages written in standard syntax, allowing a gradual transition from JSP pages to JSP documents.
In basic difference between two is : 1: A JSP document is a JSP page written in XML syntax as opposed to the standard syntax. 2: As JSP document is written in XML syntax, a JSP document is also an XML document and therefore it can take all the benefits offered by the XML standard. 3: Jsp pages are saved having file extension of .jsp , while JSP documents having .jspx extension. 4: The main difference is Standard Syntax(that JSP page use) Versus XML Syntax(that a JSP Document use).