What's the difference between <craft> and <craft hidden="0"> ?

In the CraftDB.xml some items have the <craft> tag, others have the <craft hidden=0> tag.
What's the difference between them?

For example:

<craft hidden="0">
<output skill="1" name="Bony Wand"/>
<tool tag="lathe" />
<input name="Burnt Out Wand"/>
<input name="Bone Club"/>
<input name="Sewer Brew"/>
</craft>

<craft>
<output skill="3" name="Stony Wand"/>
<tool tag="lathe" />
<input name="Burnt Out Wand"/>
<input name="Salt"/>
<input name="Hematite" />
<input name="Malachite" />
</craft>

 

If it's a hidden recipe, you'll have to find it in a bookshelf before you'll be able to make it.

So no difference here, because none of them is hidden.

 

Hidden recipes shouldn't have the tag <craft hidden=1> instead of <craft hidden=0> ?

 

Yes, they should have. But I never said that <craft hidden="0"> makes them hidden.

The point is, the only difference here is that the <craft hidden="0"> one gives you a recipe that is not hidden, while just <craft> gives you a recipe that will use the default value for the "hidden" parameter (which is 0, coincidentally). So as of now there is really no difference between the two.

 

Ok, thank you!