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+xmlformat is distributed under a BSD-style license.  This license
+applies to the entire xmlformat distribution, with the exception of
+the REX parser (described below).
+
+Copyright (c) 2004, Kitebird, LLC.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the name of Kitebird nor the names of its contributors may
+   be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+The REX parser
+
+xmlformat contains code based on the REX parser, which is Copyright (c) 1998,
+Robert D. Cameron.  REX is described in this document:
+
+	http://www.cs.sfu.ca/~cameron/REX.html
+
+The document contains a Perl implementation of REX:
+
+--- begin REX code ---
+# REX/Perl 1.0 
+# Robert D. Cameron "REX: XML Shallow Parsing with Regular Expressions",
+# Technical Report TR 1998-17, School of Computing Science, Simon Fraser 
+# University, November, 1998.
+# Copyright (c) 1998, Robert D. Cameron. 
+# The following code may be freely used and distributed provided that
+# this copyright and citation notice remains intact and that modifications
+# or additions are clearly identified.
+
+$TextSE = "[^<]+";
+$UntilHyphen = "[^-]*-";
+$Until2Hyphens = "$UntilHyphen(?:[^-]$UntilHyphen)*-";
+$CommentCE = "$Until2Hyphens>?";
+$UntilRSBs = "[^\\]]*](?:[^\\]]+])*]+";
+$CDATA_CE = "$UntilRSBs(?:[^\\]>]$UntilRSBs)*>";
+$S = "[ \\n\\t\\r]+";
+$NameStrt = "[A-Za-z_:]|[^\\x00-\\x7F]";
+$NameChar = "[A-Za-z0-9_:.-]|[^\\x00-\\x7F]";
+$Name = "(?:$NameStrt)(?:$NameChar)*";
+$QuoteSE = "\"[^\"]*\"|'[^']*'";
+$DT_IdentSE = "$S$Name(?:$S(?:$Name|$QuoteSE))*";
+$MarkupDeclCE = "(?:[^\\]\"'><]+|$QuoteSE)*>";
+$S1 = "[\\n\\r\\t ]";
+$UntilQMs = "[^?]*\\?+";
+$PI_Tail = "\\?>|$S1$UntilQMs(?:[^>?]$UntilQMs)*>";
+$DT_ItemSE =
+"<(?:!(?:--$Until2Hyphens>|[^-]$MarkupDeclCE)|\\?$Name(?:$PI_Tail))|%$Name;|$S";
+$DocTypeCE = "$DT_IdentSE(?:$S)?(?:\\[(?:$DT_ItemSE)*](?:$S)?)?>?";
+$DeclCE =
+"--(?:$CommentCE)?|\\[CDATA\\[(?:$CDATA_CE)?|DOCTYPE(?:$DocTypeCE)?";
+$PI_CE = "$Name(?:$PI_Tail)?";
+$EndTagCE = "$Name(?:$S)?>?";
+$AttValSE = "\"[^<\"]*\"|'[^<']*'";
+$ElemTagCE = "$Name(?:$S$Name(?:$S)?=(?:$S)?(?:$AttValSE))*(?:$S)?/?>?";
+$MarkupSPE =
+"<(?:!(?:$DeclCE)?|\\?(?:$PI_CE)?|/(?:$EndTagCE)?|(?:$ElemTagCE)?)";
+$XML_SPE = "$TextSE|$MarkupSPE";
+
+
+sub ShallowParse { 
+  my($XML_document) = @_;
+  return $XML_document =~ /$XML_SPE/g;
+}
+--- end REX code ---
+
+The Perl and Ruby implementations of xmlformat contain parsers that
+are based on the preceding code and are essentially the same, with the
+exception of changes to variable and function names.
+