[MacPorts] #43386: docbook-sgml-4.2 @4.2 update to use common infrastructure

[MacPorts]

#43386: docbook-sgml-4.2 @4.2 update to use common infrastructure
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 Reporter:  tlockhart1976@…  |      Owner:  macports-tickets@…
     Type:  enhancement      |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.2.1
 Keywords:  haspatch         |       Port:  docbook-sgml-4.2
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 Ticket #41708 includes a new PortGroup "xmlcatalog" which provides support
 for sgml and xml catalog maintenance across various docbook packages.
 I've got patches included in that ticket which have changes to docbook-
 sgml-4.2. The specific patch for this Portfile is included here for
 reference, as is the new PortGroup file.
 Please let me know if you have concerns or questions. Thanks!

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Ticket URL: <https://trac.macports.org/ticket/43386>
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