You would think that was a simple question, sorry if this is over kill
It's been a very long time since I created a character so I maybe wrong on this, but I believe it is still one specialization per category. I.E. One combat specialization, one crafting, one resource. (I should stop now) However you can lock two skills once you have them maxed in game. So if you get logging to 100 you can lock it, then work on say Fishing until 100 and lock it, and in theory raise a third to 100 by working it up as well. And you can do this with each category. So once you are going you can in theory specialize in may skills.
The trick is (and I'm sure you can see by the stats chart) is that there are associated stats with each skill, and a soft cap on max skills and stats making it tricky to master many skills. As you raise something like Logging your strength and agility will raise, but the skills you use the least can start to drop and so does the associated stats. So I would try and choose a couple skills that compliment each other as much as possible and plan on those being your specialized skills.
Being a tribe leader I have had to be a Jack of all trades at times, so my stats YoYo around all the time . However I keep my main stats up. Like Intellect/Fortitude for Tool crafting and Fortitude/Charm for Bone crafting. Since Fortitude and charm are needed for Bone craft, Masonry is a good second skill since it uses the same stats.
Since you mentioned Logging (str/Agi) you could do Wood crafting (Agi/Spi) and Basketry (Agi/Spi) and most of your stats would compliment the others. Add Axes or Clubs for (strength) for combat and you have a good start.
The more you specialize the faster you will gain,and the less you will lose other stats. So if you plan to solo in the world of Xsyon and if you want to be a master at your trade, you may need to trade for some of the better materials and items you can't make or get yourself. However if you don't care about being the best and just want to enjoy the game, you can do all and everything the game has to offer by yourself.
I hope this helps you get started, and if anyone sees errors in my assessment, please feel free to correct this