2.1.1181 Part 4 Section 4.6.12, bldDgm (Build Diagram)
a. The standard implies that the bldDgm element specifies how to build animation for any diagram.
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PowerPoint only uses this element for OLE diagrams.
b. The standard places no restrictions on what the spid attribute refers to.
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PowerPoint requires that the spid attribute reference a valid OLE diagram that is present on the slide.
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 bldDgm element form a unique pair within the parent bldLst element.
d. 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.