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From the tests performed on the The Hague plugtest wiki.

Testing spreadsheets with an embedded chart revealed that implementations use <chart:plot-area table:cell-range-address... and <chart:series chart:values-cell-range-address... differently: that is, some implementations set the first, others use the latter or both.

See ODF 1.1, 10.1 Introduction to Chart Documents

"The chart data is specified by the <chart:plot-area>element's table:cell-range-address attribute"

And 10.9 Series, Cell range
"The chart:values-cell-range-address attribute allows a range to be specified that contains the values that should be visualized by this data series"

So it seems that the use of <chart:plot-area table:cell-range-address... is mandatory in 1.1.

ODF 1.2cd2, however, mentions this:

10.4, <chart:plot-area>
"If data for a chart is provided by a document other than the chart document itself, then the table:cell-range-address attribute defines the ranges in that providing document that contain the data. This data is interpreted by the chart as consecutive series. Addressing of documents is described in 17.913.
If the chart data is to be taken from the table element contained in the <chart:chart> element itself, then the table:cell-range-address attribute must be omitted."

See also the mail from Daniel Rentz (http://lists.oasis-open.org/archives/oic/200906/msg00065.html)