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Once the Mac OS does kick-off the extraction of metadata from a file, it does so through a Spotlight Importer. Spotlight Importers are plug-ins for the Mac OS that a developer provides specifically for helping files created by their applications to be searchable within Spotlight. Mac OS software 0 Comments MetaImage Mac cracked version – MetaImage is a tool to read, write and edit images metadata. This editor allows you to edit EXIF, IPTC and XMP tags as well as MakerNotes in a beautiful and familiar interface.

Mess of Metadata


© May 2019 Anthony Lawrence

There was a long series of comments at the article about mdfind that got very confused talking about OS X metadata. I thought I'd try to straighten some of that out in a separate post - though honestly I'm still easily confused myself!

First, what metadata are we talking about? For an old Unix hand, the metadata is information stored in the inode: file size, permissions, pointers to datablocks, link counts.. that's traditional metadata.

However, there's more metadata today - not just in Unix systems, but especially in Mac OS X. There are extended permissions, acl's, xattributes, Spotlight related metadata.. it's very hard to ferret all this out of Google because similar terms are used for dissimilar features.

Macs had 'resource forks' early on. OS X still has resource forks. but apparently Apple would like to move away from those. That's probably why things get so darn confusing: search for information on metadata and OS X and you'll find lots of pointers to things that talk about resource forks, but usually that's deprecated and doesn't usually apply to OS X.

Let's take Spotlight metadata first. These are specific keys that Spotlight indexes. For example, you can do things like this:

How does Spotlight get the info to index? It asks an Spotlight Importer. This BASICS OF SPOTLIGHT page explains:

Once the Mac OS does kick-off the extraction of metadata from a file, it does so through a Spotlight Importer. Spotlight Importers are plug-ins for the Mac OS that a developer provides specifically for helping files created by their applications to be searchable within Spotlight. Spotlight crawls through its list of changed files, handing each one to the appropriate importer. The importers then read the files, compile a list of metadata, and then hand the metadata back to Spotlight. At this point, the changed file is available for searching within Spotlight.

OK, great, but where does the metadata that the importer supplies come from? Apparently, that's up to the developer. Apple's Extracting Metadata from Documents says:

Avoid the use of external files to store metadata content. All critical metadata should be in the same file as the data. The system store of metadata should be considered volatile.

I want to quibble a little: if it's stored in the data file, it's really not metadata, is it? But never mind. Some apps do it that way. For example, ID3 tags. But other apps do not. For example. In my ~/Library/Caches/Metadata I found some interesting stuff. *Some* apps store Spotlight metadata there. I found:

If I look in Billings, I find this:

But obviously not all apps store their Spotlight related metadata there. Entourage does, as seen in this HOW DOES ENTOURAGE WORK WITH SPOTLIGHT? bit:

When you enable Spotlight indexing within Entourage, a 'cache' file is created for each item within your Entourage database. If you have 100,000 e-mail messages in your Entourage database, 100,000 cache files will be created. If you want to see the cache files, you can find them within your Library/Caches/Metadata/Microsoft folder.
Each cache file contains all the metadata that will be needed for indexing by Spotlight. All changes within Entourage are reflected to the cache files. Create a new item and a new cache file will be created. Updated an item and its cache file will update. Delete an item and its cache file will be deleted. With all these changes, Spotlight receives file change notifications and eventually will ask the modified cache files to go through the import process using the Entourage Spotlight Importer.

But there's no iTunes folder there..

There are also defaults. If I create a text file with 'date > file', an 'mdls' will show Spotlight keys:

Obviously the 'date' command didn't create those. Spotlight won't even index that file (no extension), but it has some default keys just the same! See Spotlight, mdfind (Mac OS X Tiger searching) for more on that.

You can add metadata yourself and can modify one item of Spotlight's domain.

The only Spotlight related data you can modify is kMDItemFinderComment. You do that with GetInfo and after adding it, xattr shows this:

Note that this gives us the clue as to where the data was stored, but I don't find a file with that 'com.apple.metadata' name. I do find:

But those aren't related.

So what do we know? Well, we know it's up to the application responsible for a file to provide importer code. It's up to the same app to decide where to store metadata. Obviously, that implies that for some data that would be the across all files of this type, there's no need to store it anywhere - the importer could generate the response when Spotlight asks.

That's as far as I've gone.. maybe someone else can add more.


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Take Control of Numbers
Digital Sharing Crash Course
Take Control of IOS 11
Take control of Apple TV, Second Edition
Sierra: A Take Control Crash Course

The trading platform can be installed and used on computers that run Mac OS using Wine. Wine is a free and open source software application that aims to allow applications designed for Microsoft Windows to run on Unix-like operating systems. One of the Wine versions is designed for Mac OS.

Note that Wine is not a fully stable application. This means that some functions in the applications you start under it may work improperly or not work at all.

The easiest way to install the trading platform is download the ready-made package from the official website. Install the platform similarly to any other application — drag the platform icon to Applications and wait for the installation to complete.

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The trading platform for Mac OS supports the Apple M1 chip and works reliably on any system version including Big Sur.

The installation package is compiled using CrossOver technology. This platform is based on Wine, but unlike other projects and Wine itself, CrossOver is a commercial product. Therefore, its development is much faster: the environment is optimized for better performance of Windows applications, while detected errors are quickly fixed. In contrast to 'pure' Wine, CrossOver has more specialized nature as it is aimed at supporting the most popular office and other Windows applications. Compatibility with these applications is extensively tested and debugged, so they tend to run more stable than in Wine. The trading platform is among these applications.

You do not need to have CrossOver on your computer to install the platform from the ready-made DMG package. Accordingly, its use is absolutely free. You do not need to download any additional components or make any complex adjustments. The platform is immediately ready to go after being installed from the package.

If this does not suit you for some reason, below is an alternative way to launch the platform on your Mac.

PlayOnMac Installation

PlayOnMac is a Wine-based free software providing easy installation and use of Windows applications on Mac OS.

To install PlayOnMac, go to its official website, open the Downloads section and click the link to download the latest version.

Run the downloaded DMG package from the Downloads section of your system:

This opens the PlayOnMac first launch window. Upon clicking 'Next' the installer starts checking and installing various components required for operation.

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The first required component is XQuartz. This is a software tool for using X Window System on Mac OS. X Window System provides standard tools and protocols for building a graphical user interface on UNIX-like OS.

If you have already installed XQuartz or want to install it later, select 'Don't install XQuartz for the moment' or 'I've downloaded file by myself', respectively.

XQuartz is installed in several stages. First of all, read the important information (Read Me) and accept the license terms.

Before the installation, Mac OS security system requests your account password:

Wait for the installation to complete. For the changes to take effect, restart your computer.

After system restart, launch PlayOnMac from the setup file in the Downloads folder. The first launch window will appear again. This time, the installer will offer to install MS Windows fonts required for proper operation.

Accept the license agreement terms and complete the installation. After that, PlayOnMac is ready for use:

Updating Wine

Wine is installed together with PlayOnMac.

To update Wine to the latest version, open the top menu of PlayOnMac and select 'Manage Wine Versions':

The window with Wine versions available for installation will open. Select the latest version.

Move the latest Wine version to the right side of the window. The installation process starts after that.

After installation, the new version of Wine will appear in the left pane of PlayOnMac Wine versions manager. You can then close the window and install the trading platform.

Platform Installation

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To install the platform, download its installer 'mt5setup.exe'. When the download completes, run the setup file. The file is automatically opened by PlayOnMac.

This will launch the standard installation process, go through all its stages:

After installation PlayOnMac prompts you to create shortcuts for the platform components, including the trading platform, MetaEditor and MetaTester:

Once the necessary shortcuts are created, you can start using the platform. Double click on it in PlayOnMac window to run the platform.

Platform Data Directory

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PlayOnMac creates a separate virtual logical drive with necessary environment for each installed program. The default path of the installed platform's data folder is as follows:

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LibraryPlayOnMacWinePrefixClient_Terminal_DriveCProgramFilesClient Terminal