[Mono-list] - XslCompiledTransform.Load missing overloads

Danny dgortonii at gmail.com
Thu Sep 24 11:41:44 EDT 2009

And, to chant the mantra: Patches are always welcome.  (Not that I've 
ever submitted any, but it begged to be said).

daniel wrote:
> Thats a shame.
> It appears from our testing that non compiled xslt is an order of 
> magnitude slower then the compiled version. Which for our purposes is to 
> slow.
> I see from the msdn documentation that loading by type was added in .net 
> 2.0 SP1. So it wasn't in .net 2.0. Which explains why it is missing from 
> mono 2.0
> Even if you can't make a compatible type loading method. Is it possible 
> to make your own non compatible xslt compiler in order to get the speed 
> boost. IE the point of XslCompiledTransform is to compile the xslt into 
> MSIL, this will then execute much faster then a XSLT interpreter.
> I guess the question is how can you implement a class with 'Compiled' in 
> the name using an interpreter. It's just plain misleading. If you can't 
> make do a 'Compiled' transform then why pretend? XslCompiledTransform 
> should be maked as not implemented/ throw a not implemented exception 
> rather then pretend its a compiled transform when its actually an 
> interpreter.
> As a user if I wanted an interpreted transform I would have used 
> XslTransform. I would rather its was obvious that mono didn't have a 
> compiled transform then that it appeared to all the world to have one 
> but actually didn't.
> OK so imagine that mono had implemented StringBuilder using normal 
> string concatenation. Sure it would correctly add strings together but 
> it wouldn't do the thing that people use it for, That is to provide an 
> faster more efficient method of adding strings together. Its the same 
> with  XslCompiledTransform. People use XslCompiledTransform because its 
> faster, because its 'compiled'. That is its whole reason for it 
> existing, thats the reason why Microsoft added it rather then just 
> sticking with the existing XslTransform.
> If you had a XSLT Compiler you could have a fastest XSLT transformer in 
> linux. Our testing to date puts the .net implementation of 
> XslCompiledTransform significantly faster then any other method of 
> performing XSLT transforms on windows. It would give mono bragging 
> rights as well as provide a compelling reason for people doing xslt on 
> linux to use mono.
> Thats my 2 cents worth.
> Sincerely,
> Daniel
> Atsushi Eno wrote:
>> NET XslCompiledTransform has horrible design choice that there is *no* 
>> public API
>> exposed to make compiled XSLT implementable. There is no choice for us 
>> to implement
>> it at least from public documentation. We won't support it beyond any 
>> wrapper.
>> (I feel almost no need to add this comment, but: loading stylesheet by 
>> compiled type is
>> newer stuff than we have finished 2.0 API. Besides/anyways I don't 
>> really care about tiny,
>> cosmetic, minor API missings like other API lands.)
>> Atsushi Eno
>> On 2009/09/24 14:50, Daniel Hughes wrote:
>>> XslCompiledTransform.Load appears to only have 6 overloads where as 
>>> .net has 8. The two missing overloads are for loading an already 
>>> compiled transform from a type. These are the overloads I need. When I 
>>> started investigating this I also recognized that the transform on 
>>> mono appears to be a lot slow then it should be.....
>>> I have a horrible thought that XslCompiledTransfrom in mono is just a 
>>> wrapper for XslTransfrom and so it not compiled at all... so none of 
>>> the speed improvement are available.
>>> Please tell me this is not the case and that I am just doing something 
>>> wrong. XslCompiledTransfrom is a .net 2.0 libary I had heard that mono 
>>> had a complete implementation of .net 2.0.
>>> Cheers,
>>> Daniel Hughes
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