External Reference FilesOverview
The following are Xref characteristics:
– An external reference file is known as an “Xref”.
– Current drawing contains only a “pointer”, the path and filename, to the Xref.
– The current drawing does not increase much in size when it contains an Xref.
– The Xref is reloaded each time the current drawing is loaded, thus always showing the latest revision of the Xref.
– Xrefs import their linetypes, layers, text styles, dimstyles, v iews, ucs’s vports, and blocks into their current drawing.
– Each Xref named object is prefixed with the xref drawing name and a pipe “|” symbol. (i.e. HOUSE|A-WALL for drawing house.dwg and layer a-wall)
– Xdep stands for external reference dependent objects.
– Xref’s layers can be turned on/off in the current drawing.
– Layer zero(0) resides on layer zero(0) of the current drawing.
– Xrefs can be bound to the current drawing, in which case they become blocks.
Editing Xrefs (Xref Manager)
Overlay an Xref
Overlays are typically used when you need to view another drawing’s geometry temporarily, but don’t plan to plot using that data. In the following illustration, several people are working on drawings referenced by master.dwg. The person working on a.dwg needs to see the work being completed by the person working on b.dwg , but does not want to xref b.dwg because it would then appear twice in master.dwg. Instead, the person overlays b.dwg, which is not included when a.dwg is referenced by master.dwg.