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Subject: [OASIS Issue Tracker] (OFFICE-3953) Allow presentation to start with slide number 0

Regina Henschel created OFFICE-3953:

             Summary: Allow presentation to start with slide number 0
                 Key: OFFICE-3953
                 URL: https://issues.oasis-open.org/browse/OFFICE-3953
             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
          Issue Type: Bug
          Components: Presentation
    Affects Versions: ODF 1.2
            Reporter: Regina Henschel

PowerPoint allows, that a presentation starts with number 0. The start value of slide numbering is given by the attribute {{firstSlideNum}} of element {{<p:presentation>}} in OOXML. Even negative values are allowed in OOXML.
{code:xml}<xsd:attribute name="firstSlideNum" type="xsd:int" use="optional" default="1"/>{code}

The corresponding attribute in ODF is {{20.258 style:first-page-number}}. Here we have the description text
{quote}The value of this attribute can be an integer or continue.{quote}
But in the schema there is
{code:xml}<attribute name="style:first-page-number">
		<ref name="positiveInteger"/>
So my suggestion is to allow at least the value 0 too. LibreOffice has not yet implemented the attribute {{style:first-page-number}}, but there exists an enhancement request about more flexible page numbering https://bugs.documentfoundation.org/show_bug.cgi?id=115611 . I have no strong opinion, whether negative values should be allowed. For interoperability with pptx format of PowerPoint or SoftMaker, only value 0 is needed.

We have made a similar change in https://issues.oasis-open.org/browse/OFFICE-3923 for the attribute {{style:page-number}}, which is used in text documents.

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