src/Pure/ProofGeneral/pgml.ML
2010-08-07 wenzelm simplified type XML.tree: embed Markup.T directly, avoid slightly odd triple;
2009-10-20 wenzelm standardized basic operations on type option;
2009-01-21 wenzelm removed Ids;
2008-08-27 wenzelm fixed atom_to_xml: literal "name" attribute;
2008-08-27 wenzelm exported atom_to_xml;
2008-08-27 wenzelm get rid of tabs;
2008-04-03 wenzelm further cleanup of XML signature;
2007-09-15 haftmann fixed title
2007-07-11 aspinall Track schema changes: add area attribute to pgml packet. Also add quoted Raw element [hack for Isabelle bottom-up XML production]
2007-07-10 wenzelm renamed XML.Rawtext to XML.Output;
2007-07-06 aspinall Produce good PGML 2.0
2007-07-05 aspinall Revert body of pgml to match schema for now [change bad for Broker]
2007-07-04 aspinall PGML abstraction, draft version
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