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External reference
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This article is about nesting part of content from external document inside another document. It differ Xref for meaning as Cross-reference. History External reference was introduced in CAD programs at second half of 80's years of 20th century. First implementation was in Intergraph's Interactive Graphics Design System (IGDS) CAD programs described in Intergraph Standard File Formats. Most popular became with Autodesk Autocad. Using An external reference (xRef) is a kind of a block in that it is stored in the current drawing's block library. However, unlike a block, the objects associated with an xref definition are not stored in the current drawing; they are stored in another drawing file. When you create an xref, the entire contents of this other file are imported as a block. |
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