What is a DAO and why does it matter to AEC?

Introduction Blockchain technology has revolutionized many industries worldwide, and the Architecture, Engineering, and Construction (AEC) industry is no exception. A significant innovation in this context is the DAO, which is a "Decentralized Autonomous Organization". A DAO is a blockchain-based organizational structure that operates decentralised, enabling transparent and collaborative decision-making and facilitating participatory governance. In this article, we'll explore what exactly a DAO is and why it's relevant and important to the AEC industry. What is a DAO? A DAO is an autonomous, organization-like entity that operates through smart contracts on a blockchain network. Unlike a traditional company, there is no hierarchical structure of power, nor the need for intermediaries such as managers or executives. Instead, decision-making is carried out collectively and transparently, through voting based on ownership of tokens or units of the DAO's native c

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AutoCAD-external-reference

Ideas how to resolve problems with binding XREFS

If you have nested xrefs that are unloaded you cannot bind them. The solution is either to detach them where they are attached or to change them from attach to overlay.

Try to PURGE both the drawing with the xrefs and each xref.

If there are nested xrefs unloaded you have to either detach them or set them to overlay

Try to bind the xrefs one by one and close and open the xref dialog box for each time and find if there is a specific drawing you cannot bind.

If you find one or more xrefs that are not bound try to attach them one by one into a new empty drawing. Now try to bind. This can give you a hint of where the problem resides.

If the xref contains proxy objects there might be an "Invalid" message. To resolve the problem try to find an object enabler. To have a hint of if there are proxy objects and what application have created them set the system variable PROXYNOTICE to 1 and reopen the drawing. If notices of proxy objects are displayed try to find the missing application. AecArchBase is for example Architectural Desktop. 


Be sure that the Show Proxy Objects option is selected on the Open and Save tab in the Options dialog box. If you are allowed to (since this destroys intelligence and maybe some geometry), you can saveas DXFr12, close the drawing, open it again and then save as DWG2000-format. This might even be necessary to be repeated twice. Try wblocking everything into a new drawing and attaching it instead of the old. You can use QSELECT to find proxy objects. Look for the Object type: ACAD_PROXY_ENTITY. Observe that if they are nested in blocks you have to explode all blocks one or many times to find it.
  • Try to recover and audit both the drawing and the xref file.
  • Check if there is a block in the xref file with the same name as the xref itself. If so rename one of them.
  • It might be possible for the one creating the xref file and having the custom application to explode the objects into plain AutoCAD objects.
  • To detach an xref that exists in multiple layouts: In each layout, erase the object representation of the xref you want to detach. From the Insert menu, choose Xref Manager. In the Xref Manager, detach the xref.
  • There might be blocks with no name.
  • If you are unable to detach multiple references. This error can occur when you try to detach an xref that is used in multiple layouts. For example, you might have referenced the same title block into multiple layouts. Make sure that you have purged the drawing as well.
  • Try do detach, attach and bind.
  • Try this on another PC. Sometimes a reboot has helped.
  • If nothing else is working detach the xref and insert it with INSERT command. But first check the inserting point, scale, rotation, layer, if it's clipped and so on.
  • Look if you have blocks with invalid names like "70/50/30" in the xref you cannot bind. <>/\":?|,=` are invalid characters in block names.

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