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  \item{repeated}{logical: should apparently already-encoded URLs be
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  \item{repeated}{logical: should apparently already-encoded URLs be
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    encoded again?}
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    encoded again?}
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}
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}
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\details{
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\details{
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  Characters in a URL other than the English alphanumeric characters and
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  Characters in a URL other than the English alphanumeric characters and
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  \samp{- _ . ~} should be encoded as \code{\%}
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  \samp{- _ . ~} should be encoded as \samp{\%}
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  plus a two-digit hexadecimal representation, and any single-byte
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  plus a two-digit hexadecimal representation, and any single-byte
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  character can be so encoded. (Multi-byte characters are encoded
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  character can be so encoded. (Multi-byte characters are encoded
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  byte-by-byte.)  The standard refers to this as \sQuote{percent-encoding}.
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  byte-by-byte.)  The standard refers to this as \sQuote{percent-encoding}.
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  In addition, \samp{! $ & ' ( ) * + , ; = : / ? @ # [ ]} are reserved
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  In addition, \samp{! $ & ' ( ) * + , ; = : / ? @ # [ ]} are reserved
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  which is scheme specific.  The default in \code{URLencode} is to leave
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  which is scheme specific.  The default in \code{URLencode} is to leave
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  them alone, which is appropriate for \samp{file://} URLs, but probably
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  them alone, which is appropriate for \samp{file://} URLs, but probably
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  not for \samp{http://} ones.
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  not for \samp{http://} ones.
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  An \sQuote{apparently already-encoded URL} is one containing
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  An \sQuote{apparently already-encoded URL} is one containing
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  \code{\%xx} for two hexadecimal digits.
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  \samp{\%xx} for two hexadecimal digits.
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}
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}
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\value{
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\value{
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  A character vector.
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  A character vector.
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}
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}
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\references{
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\references{