[rrd-users] svg output missing xmlns declaration

[R.P. Aditya]

The SVG output from rrdtool (1.2.10) is great except that the
top-level svg element is declared something like:

<svg width="1286" height="421" x="0" y="0" viewBox="-0.5 -0.5 1285.5
420.5" preserveAspectRatio="xMidYMid" font-family="Courier"
stroke-linecap="round" stroke-linejoin="round">

and to follow the spec (excerpt provided below), it should include

xmlns="http://www.w3.org/2000/svg"

otherwise it doesn't render correctly in some viewers (notably the most recent
Firefox 1.5 update which became a lot more strict when parsing svg)

so it looks like:

<svg width="1286" height="421" x="0" y="0" viewBox="-0.5 -0.5 1285.5
420.5" preserveAspectRatio="xMidYMid" font-fami\ ly="Courier"
stroke-linecap="round" stroke-linejoin="round"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">

the

xmlns:xlink="http://www.w3.org/1999/xlink"

is optional, but probably a fine thing to have in there in case
regions of an rrdtool graph are in future links to other documents.

from http://www.w3.org/TR/SVG11/struct.html

  In all cases, for compliance with the "Namespaces in XML"
  Recommendation [XML-NS], an SVG namespace declaration must be provided
  so that all SVG elements are identified as belonging to the SVG
  namespace. The following are possible ways to provide a namespace
  declaration. An xmlns attribute without a namespace prefix could be
  specified on an 'svg' element, which means that SVG is the default
  namespace for all elements within the scope of the element with the
  xmlns attribute:

  <svg xmlns="http://www.w3.org/2000/svg"...>
    <rect .../>
  </svg>

Thanks,
Adi

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