Bug fixes:
     #572 #577  Relax fix to CVE-2022-25236 (introduced with release 2.4.5)
                  with regard to all valid URI characters (RFC 3986),
                  i.e. the following set (excluding whitespace):
                  ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
                  0123456789 % -._~ :/?#[]@ !$&'()*+,;=

      Other changes:
#555 #570 #581  CMake|Windows: Store Expat version in the DLL
          #577  Document consequences of namespace separator choices not just
                  in doc/reference.html but also in header <expat.h>
          #577  Document Expat's lack of validation of namespace URIs against
                  RFC 3986, and that the XML 1.0r4 specification doesn't
                  require Expat to validate namespace URIs, and that Expat
                  may do more in that regard in future releases.
                  If you find need for strict RFC 3986 URI validation on
                  application level today, https://uriparser.github.io/ may
                  be of interest.
          #579  Fix documentation of XML_EndDoctypeDeclHandler in <expat.h>
          #575  Document that a call to XML_FreeContentModel can be done at
                  a later time from outside the element declaration handler
          #574  Make hardcoded namespace URIs easier to find in code
          #573  Update documentation on use of XML_POOR_ENTOPY on Solaris
     #569 #571  tests: Resolve use of macros NAN and INFINITY for GNU G++
                  4.8.2 on Solaris.
     #578 #580  Version info bumped from 9:6:8 to 9:7:8;
                  see https://verbump.de/ for what these numbers do

      Special thanks to:
          Jeffrey Walton
          Johnny Jazeix
          Thijs Schreijer

 Bug fixes:
     #566  Fix a regression introduced by the fix for CVE-2022-25313
             in release 2.4.5 that affects applications that (1)
             call function XML_SetElementDeclHandler and (2) are
             parsing XML that contains nested element declarations
             (e.g. "<!ELEMENT junk ((bar|foo|xyz+), zebra*)>").

 Other changes:
#567 #568  Version info bumped from 9:5:8 to 9:6:8;
             see https://verbump.de/ for what these numbers do

 Special thanks to:
     Matt Sergeant
     Samanta Navarro
     Sergei Trofimovich
          and
     NixOS
     Perl XML::Parser

 Security fixes:
     #562  CVE-2022-25235 -- Passing malformed 2- and 3-byte UTF-8
             sequences (e.g. from start tag names) to the XML
             processing application on top of Expat can cause
             arbitrary damage (e.g. code execution) depending
             on how invalid UTF-8 is handled inside the XML
             processor; validation was not their job but Expat's.
             Exploits with code execution are known to exist.
     #561  CVE-2022-25236 -- Passing (one or more) namespace separator
             characters in "xmlns[:prefix]" attribute values
             made Expat send malformed tag names to the XML
             processor on top of Expat which can cause
             arbitrary damage (e.g. code execution) depending
             on such unexpectable cases are handled inside the XML
             processor; validation was not their job but Expat's.
             Exploits with code execution are known to exist.
     #558  CVE-2022-25313 -- Fix stack exhaustion in doctype parsing
             that could be triggered by e.g. a 2 megabytes
             file with a large number of opening braces.
             Expected impact is denial of service or potentially
             arbitrary code execution.
     #560  CVE-2022-25314 -- Fix integer overflow in function copyString;
             only affects the encoding name parameter at parser creation
             time which is often hardcoded (rather than user input),
             takes a value in the gigabytes to trigger, and a 64-bit
             machine.  Expected impact is denial of service.
     #559  CVE-2022-25315 -- Fix integer overflow in function storeRawNames;
             needs input in the gigabytes and a 64-bit machine.
             Expected impact is denial of service or potentially
             arbitrary code execution.

 Other changes:
#557 #564  Version info bumped from 9:4:8 to 9:5:8;
             see https://verbump.de/ for what these numbers do

 Special thanks to:
     Ivan Fratric
     Samanta Navarro
          and
     Google Project Zero
     JetBrains