SMW’s Semantic Result Formats – Jqplotchart/Jqplotseries format – A guide

One of the most interesting aspects of Semantic Mediawiki is the data to chart integration, done though the Semantic Result Formats extension, and using the Jqplotchart and Jqplotseries formats, which in itself are based on jqPlot. However, it’s documentation and code examples are not as thorough as one can expect. Requirements To start with, just make sure you have all the proper extensions installed, namelly: Mediawiki version prior to 1.21(*) (1.20.6 is OK) Semantic Mediawiki 1.8 – Both SWM and SRF are undergoing some changes, so it’s better to keep a specific version. Semantic Results Formats 1.8 (*) There are some reports …

MediaWiki as a Document Driven decision support system: a Memex Project

This is the first article from the Semantic Web series. Not all of them are already available, but on the works: MediaWiki as a Document Driven decision support system: a Memex Project (this one) Building an enterprise wiki (Pending) A small business knowledge manager – The advanced Mediawiki (Pending) Companies are literally spending billions each year with huge and complex decision support systems, which chew tens of gigs worth of data. However, on most of them you cannot publish a link to a web service, without putting it on a Microsoft Word file. This is as companies’ fault at it …

Problems with WordPress Like Plugin and Polylang

Sometimes, drugs interact with each other, and the same happens to WordPress Plugins. The following example demonstrates one of such interactions. Both Polylang and Facebook Like plugins work completely as expected on themselves, however, when used together somethings get broken. Facebook Like plugin does somewhat what it’s name implies: add the facebook button to your wordpress blog. It’s also possible to share the page directly to facebook. Both features work flawlessly on its own. Polylang it’s one of most useful plugins you can find if you need to post stuff on two or more languages. It checks the configured language …

The state of openID third party login integration on WordPress

Last week a friend of mine asked me why count’t I simply do the same authentication scheme as on Blogger? From a user’s point of view, it made some sense: why have one more login, in as many sites. Well, from a security point of view, it may also make sense. On the aftermath of the Linkedinscandal, where around 9 million hashed passwords were disclosed, and about 2 million passwords were recovered, I wouldn’t feel confortable having another unprotected database containing sensitive user data, even if that database was mine. It’s far better to have Google, Facebook or Microsoft handle …

Upgrading the hard drive on old Macbook Pro (and upgrading to Lion)

My old 13″ Macbook Pro’s 250GB is at it’s limit. It’s full and slow, and it is running Snow Leopard. So it was time to change it all. The old disk was a 250GB Hitachi HTS542525K9SA00 with a 5400RPM rotational speed, the new, a Seagate Momentus 750GB 7200RPM beast. The Plan? 1. Get the new hard drive onto a usb case 2. Install Snow Leopard on it 3. Install Lion on the usb drive 4. Check if all the applications are ok 5. copy all the data from the old drive to the new one (*) 6. Install the new drive …

Problems of replicating Virtual Machine

One of the biggest advantages of VMs, is the capability of cloning and replicating them. This allows the creation of a number of similar systems, without having to replicate the configuration and installation time. Unfortunately , there are a small number of downsides: The MAC addresses are also cloned. Remember to generate new MAC addresses on each new cloned VM. Also, Ubunto caches this value, which will generate a typical error message on dmesg: “udev: renamed network interface eth0 to eth1” . To avoid this problem, delete the the file /etc/udev/rules.d/70-persistent-net.rules and restart the system.

How to manage a small Virtual Machine infrastructure

Over the last months, I felt the need to start a small virtual machine infrastructure to manage every small need on a laboratory at work. The set up infrastructure is the following: 1x Apple Macbook Pro 4.1 – for development of the appliances 2x HP DL360 with 8GB RAM running Ubuntu 10.4 – to run the VMs Note that is this NOT a production environment. This only covers a LAB needs and requirements, so stuff like redundancy and fail safe will not be included.   Over the next few weeks, I’ll add some important notes.   Workflow The workflow is …

Recover data from a non booting Macbook Air (OSX 10.6 and 10.7, and probably 10.8)

The Macbook Air is the best tool for someone whose main function is to attend to meetings. Although the new (2011) models all feature SSDs, the older models only offered those as an option. As such, even the best build machines are not free from hard drive failures, which remain as the component with highest failing component. Regardless, in case you get stuck with a non booting Macbook Air,  here’s how to recover the data: 1. First, why does this even works? Simple. OSX uses a kind of file system called “Journaled“, which is far different from FAT or NTFS, …

Check opened files by a process on OSX

Recently i’ve been fighting some performance issues with Spotlight on OSX 10.6. As sad as it may seem, the problem is not on Spotlight it selft, but on it’s reliance on third parties to search inside files. On my case, the issue is related to Office 2010 Exel files: Jul 26 10:52:51 macbook-2 mdworker32[18995]: (Normal) Import: Spotlight giving up on importing file /Users/xxx/Library/Mail/Mailboxes/xxx/xxx.mbox/Attachments/156147/2/_excel_filename_.xlsx after 240 seconds, 235.697 seconds of which was spent in the Spotlight importer plugin. Which makes Spotlight take DAYS for index all my files and emails. Regardless, the way to ckeck what Sportlight is actually doing is …

Comments and registration now available!

Hi all, I’m very sorry for the interruption on the continuous flow of posts I was managing up until September, but as everyone, when the workload increases, non-essential stuff start to get set aside. Regardless, this projects hasn’t ended, and the flow of new visitors has now got to a stable level. As such, registration for new users and comments are now open to all. Feel free to comment on anything you don’t agree or any other stuff you find relevant.