2.1.1147 Part 1 Section 19.5.13, bldGraphic (Build Graphics)
a. The standard places no restrictions on what the spid attribute refers to.
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PowerPoint requires that the spid attribute reference a chart or diagram that is present on the slide.
b. The standard places no restrictions on what the grpId attribute refers to.
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PowerPoint requires that the grpID attribute reference a group that is present in the timing tree.
c. The standard places no restrictions on the relationship between the spid attribute, the grpId attribute, and the parent bldLst element.
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PowerPoint requires that the combination of the spid attribute and the grpId attribute on a given bldGraphic element form a unique pair within the parent bldLst element.