Get the value of an attribute in an XML node
This is a convenience function that retrieves the value of a named attribute in an XML node, taking care of checking for its existence. It also allows the caller to provide a default value to use as the return value if the attribute is not present.
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the XML node
the name of the attribute
a value to use as the default return if the attribute is not present in the XML node.
an optional function which if supplied is invoked
with the attribute value and the value returned.
This can be used to convert the string to an arbitrary
value which is useful if it is, for example, a number.
This is only called if the attribute exists within the node.
In other words, it is not applied to the
a named character vector giving
name space prefixes and URIs to use when resolving for the
the attribute with a namespace.
The values are used to compare the name space prefix used in
a logical value that indicates whether we should put the
namespace prefix on the resulting name.
This is passed on to
This just checks that the attribute list is non-NULL and that there is an element with the specified name.
attribute is present,
the return value is a string which is the value of the attribute.
Otherwise, the value of
default is returned.
Duncan Temple Lang
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node <- xmlNode("foo", attrs=c(a="1", b="my name")) xmlGetAttr(node, "a") xmlGetAttr(node, "doesn't exist", "My own default value") xmlGetAttr(node, "b", "Just in case")
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