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XMLTools[IsProcessingInstruction] - determine if an expression is an XML processing instruction data structure
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Calling Sequence
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IsProcessingInstruction(expr)
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Parameters
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expr
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anything; expression to test
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Description
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The IsProcessingInstruction(expr) command tests whether a Maple expression expr is an XML processing instruction data structure. If expr is an XML processing instruction data structure, the value true is returned. Otherwise, false is returned.
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Such expressions can be encountered in XML documents that are read from external sources, or can be generated programmatically by using the XMLTools[XMLProcessingInstruction] constructor.
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Every valid XML document begins with the processing instruction  .
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