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    <p>Wikipedia offers two versions of Base64 that are usable in XML namespaces.</p> <p><a href="http://en.wikipedia.org/wiki/Base64#XML" rel="nofollow">http://en.wikipedia.org/wiki/Base64#XML</a>. I wrote the following JAVA that follows to do URLSafe, UUIDs in Java, (call theObjectReturned.toString() to get it as a guid string).</p> <p>I've seen other code for Java that is supposed to be very fast and could be easily modified to do the XML safe variants:</p> <p><a href="http://iharder.sourceforge.net/current/java/base64/" rel="nofollow">http://iharder.sourceforge.net/current/java/base64/</a></p> <p>code follows. Save in a file called UUIDUtil.java</p> <pre><code>public class UUIDUtil{ public static UUID combUUID(){ private UUID srcUUID = UUID.randomUUID();; private java.sql.Timestamp ts = new java.sql.Timestamp(Calendar.getInstance().getTime().getTime()); long upper16OfLowerUUID = this.zeroLower48BitsOfLong( srcUUID.getLeastSignificantBits() ); long lower48Time = UUIDUtil.zeroUpper16BitsOfLong( ts ); long lowerLongForNewUUID = upper16OfLowerUUID | lower48Time; return new UUID( srcUUID.getMostSignificantBits(), lowerLongForNewUUID ); } public static base64URLSafeOfUUIDObject( UUID uuid ){ byte[] bytes = ByteBuffer.allocate(16).putLong(0, uuid.getLeastSignificantBits()).putLong(8, uuid.getMostSignificantBits()).array(); return Base64.encodeBase64URLSafeString( bytes ); } public static base64URLSafeOfUUIDString( String uuidString ){ UUID uuid = UUID.fromString( uuidString ); return UUIDUtil.base64URLSafeOfUUIDObject( uuid ); } private static long zeroLower48BitsOfLong( long longVar ){ long upper16BitMask = -281474976710656L; return longVar &amp; upper16BitMask; } private static void zeroUpper16BitsOfLong( long longVar ){ long lower48BitMask = 281474976710656L-1L; return longVar &amp; lower48BitMask; } </code></pre> <p>}</p>
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    1. POAlternatives to traditional algorithms for encoding UUIDS (e.g. Base32, Base62)
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    1. USDennis
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    1. COVery interesting. But problem with the approaches you mention in XML is that element names may not begin with a digit and may not start with 'xml'or 'XML'. Both the Wikipedia article's approach and the base64URLSafeOfUUIDObject will lead to some encodings that dont match those requirements.
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    2. COI would not even have thought of using the output of a UUID generator for the name of element, only the datum in an element. Can you give me an example of doing that? Just to satisfy my curiosity and ingnorance? :-)
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