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.\" ========================================================================
.\"
.IX Title "LUA-URI-URN-ISBN 3"
.TH LUA-URI-URN-ISBN 3 "2012-00-00" "1.1" "Lua uri.urn.isbn module"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "Name"
.IX Header "Name"
lua-uri-urn-isbn \- \s-1ISBN URN\s0 support for Lua \s-1URI\s0 library
.SH "Description"
.IX Header "Description"
The class \f(CW\*(C`uri.urn.isbn\*(C'\fR is used for URNs with the \s-1NID \s0'isbn', that is, URIs
which begin \f(CW\*(C`urn:isbn:\*(C'\fR.  It inherits from the uri.urn
class.
.PP
Some of the functionality of this class depends on the \fIlua\-isbn\fR\|(3) module
being installed, although it can be used without that.  In particular, if the
module is installed then full checksum validation of the \s-1ISBN\s0 is performed,
whereas without it the \s-1ISBN\s0 is only checked for invalid characters.  The \s-1ISBN\s0
value is normalized to include hyphens in the conventional places if the
lua-isbn module is installed (the exact hyphen positions depend on the number),
but without it all hyphens are removed instead.  If the \s-1ISBN\s0 ends in a checksum
of 'x', then it folded to uppercase.
.SH "Methods"
.IX Header "Methods"
All the methods defined in \fIlua\-uri\fR\|(3) and \fIlua\-uri\-urn\fR\|(3) are supported,
as well as the following:
.IP "uri:isbn(...)" 4
.IX Item "uri:isbn(...)"
Get or set the \s-1ISBN\s0 value as an object of the type provided by the \f(CW\*(C`isbn\*(C'\fR
class in the \fIlua\-isbn\fR\|(3) library.  This method will throw an exception
if this library is not installed, or if the object supplied is not a valid
\&\s-1ISBN\s0 object (it will currently accept a string, but you shouldn't rely on
this).
.IP "uri:isbn_digits(...)" 4
.IX Item "uri:isbn_digits(...)"
Get or set the \s-1ISBN\s0 value as a string containing just the numbers (and
possibly an 'X' as the last digit).  There will be no hyphens in this value,
and it should be exactly 10 or 13 characters long.
.Sp
If a new value is provided then it must not be nil, and will be validated in
the normal way, causing an exception if it is invalid.
.SH "References"
.IX Header "References"
This implements the 'isbn' \s-1NID\s0 defined in \*(L"\s-1RFC 3187\*(R"\s0, and is consistent
with the same \s-1NID\s0 suggested in \*(L"\s-1RFC 2288\*(R"\s0.