[Libreoffice-bugs] [Bug 158310] New: When exporting ODF to MML the infinity char (∞) is incorrectly exported as the Infinity html entity ∞ which is not valid XML

Tue, 21 Nov 2023 23:15:20 -0800 

https://bugs.documentfoundation.org/show_bug.cgi?id=158310

            Bug ID: 158310
           Summary: When exporting ODF to MML the infinity char (∞) is
                    incorrectly exported as the Infinity html entity
                    ∞ which is not valid XML
           Product: LibreOffice
           Version: 7.6.2.1 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Formula Editor
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 190953
  --> https://bugs.documentfoundation.org/attachment.cgi?id=190953&action=edit
ODF file containing a ∞ char

MathML is meant to be valid XML.

In certain conditions LibreOffice Math exports the infinity char (∞) as the
Infinity html entity ∞ which is not valid XML rendering the prodiced MML
file useless.

Consider the attached formula.odf file. When LibreOffice exports it to MML :

 * line 9 of content.xml : <mi mathvariant="normal">∞</mi>
 * is exported as <mi mathvariant="normal">&infin;</mi>

The produced file is not valid XML and will not load in a browser.

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