2.1.1213 Part 4 Section 4.6.72, spTgt (Shape Target)
a. The standard places no restrictions on what the spid attribute refers to.
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PowerPoint requires that the spid attribute refer to a cxnSp element, a graphicFrame element, a grpSp element, a pic element, or an sp element on the current slide.
b. The standard does not specify how the graphicEl, oleChartEl, subSp, and txtEl child elements are to be used.
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PowerPoint uses the graphicEl, oleChartEl, and subSp child elements to specify graphical elements to animate within a graphicFrame element; it uses the txtEl child element to specify the text elements to animate within an sp element.