The XML engine uses a Simple API for XML (SAX) model,
not a Document Object Model (DOM). SAX does not provide a random-access
lookup to the document's contents. It scans the document sequentially
and presents each item to the application one item at a time.
Does the XML Engine Validate an XML Document?
The XML engine does not validate an input XML document.
The engine assumes that the data passed to it is in valid, well-formed
XML markup. Because the engine does not use a DTD (Document Type Definition)
or SCHEMA, there is nothing to validate against.
What Is the Difference between Using the XML Engine and the
ODS MARKUP Destination?
The XML engine creates and reads XML documents. ODS
MARKUP creates, but does not read XML documents. Typically, you use
the XML engine to transport data, and you use the ODS MARKUP destination
to create XML from SAS output.
Why Do I Get Errors When Importing XML Documents Not Created
with SAS?
The XML
engine reads only files that conform to the markup types supported
in the XMLTYPE= LIBNAME statement option. Attempting to import free-form
XML documents that do not conform to the specifications required by
the supported markup types will generate errors. To successfully import
files that do not conform to the XMLTYPE= markup types, you can create
a separate XML document, called an XMLMap. The XMLMap syntax tells
the XML engine how to interpret the XML markup into a SAS data set
or data sets, variables (columns), and observations (rows). See Importing XML Documents Using an XMLMap.