This function takes an xml object, created from
and an xpath query referencing an element of the document,and returns
an R object represneting the element.
The xpath query must retrive an element, not an attribute.
A length-1 character string representing an xpath query into the document.
A prefix used to map, when necessary, between the XML
class name and the corresponding R class. For
An R object corresponding to the class(es) referenced by the xpath query.
http://www.w3.org/TR/xpath provides a very useful description of xpath. Addiitonal references are in the vignette 'Retrieving MAGE and ARR sample attributes'.
The vignettes ‘Retrieving MAGE and ARR sample attributes’ and ‘Annotation retrieval with NetAffxResource’ for detailed illustration of use.
readXml for appropriately reading XML documents.
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