[OASIS Issue Tracker] (OFFICE-3995) Allow native SVG instead of <office:binary-data> for images

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

    [ https://issues.oasis-open.org/browse/OFFICE-3995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=78404#comment-78404 ] 

Michael Stahl commented on OFFICE-3995:
---------------------------------------

regarding the versioning: typically SVG documents have a DOCTYPE declaration that identifies the version, but of course that's not possible when embedding.

there is a version element on the root svg element, but it's optional; i suggest to encourage producers to write it:
Producers *should* add the version attribute to the W3Csvg:svg element.

Svante pointed out another problem with embedding SVG is that ID attributes have to be unique in the entire file, which may require modifying the embedded SVG.

these do exist in SVG too, this is from https://www.w3.org/TR/SVG11/svgdtd.html

<!ENTITY % SVG.id.attrib
    "id ID #IMPLIED"
>

> Allow native SVG instead of <office:binary-data> for images
> -----------------------------------------------------------
>
>                 Key: OFFICE-3995
>                 URL: https://issues.oasis-open.org/browse/OFFICE-3995
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: New Feature
>            Reporter: Regina Henschel
>            Priority: Major
>             Fix For: ODF 1.4
>
>         Attachments: Relax_19Nov20.diff
>
>
> Currently applications need to use the <office:binary-data> element to store an embedded SVG-image, in case they will save to a single XML file (flat ODF). That means that the SVG-image has to be encoded to BASE64. But an SVG-image is an XML-document and therefore it would be possible to use it directly, similar as done with MathML objects. The proposal has the changes that allow use of native SVG for images where now <office:binary-data> is needed.
> Remarks to the proposal:
> The namespace attribute in element <svg:svg> is needed, because OpenDocument producer bind the prefix "svg" to the namespace "urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0".
> The referenced document is a Candidate Recommendation. In case it will be released until the release of ODF 1.4, the URL has to be adapted.
> I'm not sure, whether the restriction "at most one" is correctly described by the schema.
> My proposal is not, to use <svg:svg> instead of the <draw:image>, because then the useful attributes draw:mime-type and draw:filter-name, and using <text:p> element for e.g. a caption would not be possible. And the proposal is not about adding an <svg:svg> element as drawing object on same level as e.g. <draw:rect>.
> Defining svg-svg follows the way it is done for math-math.
> I'm not sure, whether to force xlink in case of package format. That needs discussion.



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