|CDX Constant Name:||kCDXProp_ZOrder|
|CDX Constant Value:||0x000A|
|Property of objects:||kCDXObj_Node, kCDXObj_Bond, kCDXObj_Text, kCDXObj_Graphic, kCDXObj_Curve, kCDXObj_EmbeddedObject, kCDXObj_Table, kCDXObj_NamedAlternativeGroup, kCDXObj_Spectrum, kCDXObj_TLCPlate, kCDXObj_Arrow|
|First written/read in:||ChemDraw 4.0|
Back-to-front ordering index in 2D drawing.
Items with a lower value will be ordered behind items with a higher value. ChemDraw uses this property to determine, for example, which bond is in front when two bonds cross. Note that this is a graphical property only; it can be safely omitted if a file is only intended to have chemical meaning and the exact visual display is unimportant. It can also be omitted in files where it is known that no objects overlap.
If this property is absent:
The object will be treated as if the property was present with a value of zero. That is, the object will be arranged with all other objects having a Z-ordering index of zero (those objects will be arranged among themselves randomly), and all other objects will be arranged in order, on top of them.