Hi

I'm trying to use MathML with mkiv (latest beta), but I'm getting errors.
I'm attaching the minimal example (borrowed from the wiki) and the log file.

Adam
\usemodule[mathml]
\starttext
test
\xmlprocessdata{}{
<math xmlns='http://www.w3.org/1998/Math/MathML'>
 <mrow>
  <msup> <mi>x</mi><mn>2</mn> </msup>
  <mo>+</mo>
  <mrow>
    <mn>4</mn><mi>x</mi>
  </mrow>
  <mo>+</mo>
  <mn>4</mn>
 </mrow>
</math>
}{}
\stoptext
(mathml.tex

ConTeXt  ver: 2011.02.25 22:03 MKIV  fmt: 2011.2.26  int: english/english

system          > cont-new.mkiv loaded
(/usr/share/texmf/tex/context/base/cont-new.mkiv
system          > beware: some patches loaded from cont-new.mkiv
)
system          > mathml.top loaded
system          > options > begin of optionfile
system          > options >
system          > options > % runtime options files (command line driven)
system          > options > \unprotect
system          > options > % feedback and basic job control
system          > options > % handy for special styles
system          > options > \startluacode
system          > options > document = document or { }
system          > options > document.arguments={
system          > options > }
system          > options > document.files={
system          > options >  "mathml.tex",
system          > options > }
system          > options > \stopluacode
system          > options > % process info
system          > options > \setupsystem[inputfile=mathml.tex]
system          > options > \setupsystem[\c!n=1,\c!m=1]
system          > options > % modes
system          > options > % options (not that important)
system          > options > \startsetups *runtime:options
system          > options > \stopsetups
system          > options > % styles and modules
system          > options > \startsetups *runtime:modules
system          > options > \stopsetups
system          > options > % done
system          > options > \protect \endinput
system          > options >
system          > options > end of optionfile
(mathml.top)
fonts           > latin modern fonts are not preloaded
languages       > language en is active
resolvers       > modules > loaded: 'mathml'
(/usr/share/texmf/tex/context/base/x-mathml.mkiv
loading         > ConTeXt XML Macros / MathML Renderer
<- /usr/share/texmf/tex/context/base/x-mathml.lua>
resolvers       > modules > loaded: 'calcmath'
(/usr/share/texmf/tex/context/base/x-calcmath.mkiv<+ /usr/share/texmf/tex/context/base/x-calcmath.lua>)){/usr/share/texmf/fonts/map/pdftex/context/mkiv-base.map}
fonts           > preloading latin modern fonts (second stage)
(/usr/share/texmf/tex/context/base/type-siz.mkiv) (/usr/share/texmf/tex/context/base/type-otf.mkiv){/usr/share/texmf/fonts/map/dvips/lm/lm-math.map}{/usr/share/texmf/fonts/map/dvips/lm/lm-rm.map}
fonts           > fallback modern rm 12pt is loaded
system          > begin file mathml.tex at line 2
xml             > lpath > unknown function 'remapopenmath'
xml             > lpath > unknown function 'remapmmlbind'
xml             > lpath > unknown function 'remapmmlcsymbol'
! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 7 in file mathml.tex: LuaTeX error  ...

 1     \usemodule[mathml]
 2     \starttext
 3     test
 4     \xmlprocessdata{}{
 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7 >>    <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15     </math>
16     }{}
17     \stoptext


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mo ...miter }\ctxmodulemathml {mo("#1")}
                                                  \setfalse \mmlignoredelimi...
l.7 }
     
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
\checkdelimiters ...\right \rightfakedelimiter $#1
                                                  \expandafter $\expandafter...
<argument> ...kdelimiters {\xmlall {::3}{/mml:mo}}
                                                  \fakeleftdelimiter \xmlflu...
...
l.16 }{}
        
? q
OK, entering \batchmode...
! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.


system          > tex > error on line 14 in file mathml.tex: LuaTeX error  ...

 4     \xmlprocessdata{}{
 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7       <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14 >>   </mrow>
15     </math>
16     }{}
17     \stoptext
18     


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mo ...miter }\ctxmodulemathml {mo("#1")}
                                                  \setfalse \mmlignoredelimi...
l.14 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
\checkdelimiters ...\right \rightfakedelimiter $#1
                                                  \expandafter $\expandafter...
<argument> ...kdelimiters {\xmlall {::3}{/mml:mo}}
                                                  \fakeleftdelimiter \xmlflu...
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 7 in file mathml.tex: LuaTeX error  ...

 1     \usemodule[mathml]
 2     \starttext
 3     test
 4     \xmlprocessdata{}{
 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7 >>    <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15     </math>
16     }{}
17     \stoptext


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
l.7 }
     
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
<argument> {\mmlfirst {::4}
                           }\normalsuperscript {\mmlsecond {::4}}
\firstoftwoarguments #1#2->#1
                             
l.8 }
     
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 7 in file mathml.tex: LuaTeX error  ...

 1     \usemodule[mathml]
 2     \starttext
 3     test
 4     \xmlprocessdata{}{
 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7 >>    <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15     </math>
16     }{}
17     \stoptext


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mn ...up \mr \ctxmodulemathml {mn("#1")}
                                                  \endgroup 
l.7 }
     
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
<argument> ...\normalsuperscript {\mmlsecond {::4}
                                                  }
\firstoftwoarguments #1#2->#1
                             
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 16 in file mathml.tex: LuaTeX error  ...

 6      <mrow>
 7       <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15     </math>
16 >>  }{}
17     \stoptext
18     


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mo ...miter }\ctxmodulemathml {mo("#1")}
                                                  \setfalse \mmlignoredelimi...
l.16 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
<argument> ...}}\fakeleftdelimiter \xmlflush {::3}
                                                  \fakerightdelimiter \disab...
\firstoftwoarguments #1#2->#1
                             
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 8 in file mathml.tex: LuaTeX error  ...

 1     \usemodule[mathml]
 2     \starttext
 3     test
 4     \xmlprocessdata{}{
 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7       <msup> <mi>x</mi><mn>2</mn> </msup>
 8 >>    <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15     </math>
16     }{}
17     \stoptext
18     


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mn ...up \mr \ctxmodulemathml {mn("#1")}
                                                  \endgroup 
l.8 }
     
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
\@@su:mml:mrow ...lflush {#1}}\else \xmlflush {#1}
                                                  \fi \endgroup 
l.24 }
      
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 15 in file mathml.tex: LuaTeX error  ...

 5     <math xmlns='http://www.w3.org/1998/Math/MathML'>
 6      <mrow>
 7       <msup> <mi>x</mi><mn>2</mn> </msup>
 8       <mo>+</mo>
 9       <mrow>
10         <mn>4</mn><mi>x</mi>
11       </mrow>
12       <mo>+</mo>
13       <mn>4</mn>
14      </mrow>
15 >>  </math>
16     }{}
17     \stoptext
18     


\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
l.15 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
\@@su:mml:mrow ...lflush {#1}}\else \xmlflush {#1}
                                                  \fi \endgroup 
l.24 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 32 in file mathml.tex: LuaTeX error  ...



\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mo ...miter }\ctxmodulemathml {mo("#1")}
                                                  \setfalse \mmlignoredelimi...
l.32 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
<argument> ...}}\fakeleftdelimiter \xmlflush {::3}
                                                  \fakerightdelimiter \disab...
\firstoftwoarguments #1#2->#1
                             
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

! LuaTeX error <main ctx instance>:1: attempt to index field 'mathml' (a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.

system          > tex > error on line 40 in file mathml.tex: LuaTeX error  ...



\ctxmodulemathml ...rocount {moduledata.mathml.#1}
                                                  
\@@su:mml:mn ...up \mr \ctxmodulemathml {mn("#1")}
                                                  \endgroup 
l.40 }
      
\ctxlxml #1->\directlua \zerocount {lxml.#1}
                                            
<argument> ...}}\fakeleftdelimiter \xmlflush {::3}
                                                  \fakerightdelimiter \disab...
\firstoftwoarguments #1#2->#1
                             
...
l.16 }{}
        
The lua interpreter ran into a problem, so the
remainder of this lua chunk will be ignored.

backend         > xmp > using file '/usr/share/texmf/tex/context/base/lpdf-pdx.xml'
pages           > flushing realpage 1, userpage 1, subpage 1
system          > end file mathml.tex at line 17
 )</usr/share/texmf/fonts/opentype/public/lm/lmroman12-regular.otf>
mkiv lua stats  > used config file          - /usr/share/texmf/web2c/texmfcnf.lua
mkiv lua stats  > used cache path           - /home/reviczky/.texmf-var/luatex-cache/context/e570cb3e0e3ab0118ca08dd148bbec7d
mkiv lua stats  > input load time           - 0.165 seconds
mkiv lua stats  > stored bytecode data      - 275 modules, 56 tables, 331 chunks
mkiv lua stats  > loaded tex modules        - 2 requested, 2 found (*-mathml x-calcmath), 0 missing
mkiv lua stats  > cleaned up reserved nodes - 33 nodes, 9 lists of 411
mkiv lua stats  > node memory usage         - 19 glue_spec
mkiv lua stats  > node list callback tasks  - 6 unique task lists, 6 instances (re)created, 2647 calls
mkiv lua stats  > used backend              - pdf (backend for directly generating pdf output)
mkiv lua stats  > loaded patterns           - en::2
mkiv lua stats  > callbacks                 - 2796 direct, 5272 indirect, 8068 total
mkiv lua stats  > xml load time             - 0.000 seconds, 0 files, 1 converted
mkiv lua stats  > lxml preparation time     - 0.001 seconds, 12 nodes, 26 lpath calls, 3 cached calls
mkiv lua stats  > result saved in file      - mathml.pdf
mkiv lua stats  > loaded fonts              - 33 files: stmary10.afm eufb10.tfm eufb7.tfm eufm10.tfm eufm7.tfm msam10.tfm msam7.tfm msbm10.tfm msbm7.tfm lmmono12-regular.otf lmmono8-regular.otf lmmono9-regular.otf lmroman12-bold.otf lmroman12-regular.otf lmroman7-bold.otf lmroman7-regular.otf lmroman9-bold.otf lmroman9-regular.otf lmsans12-regular.otf lmsans8-regular.otf lmsans9-regular.otf lmex10.tfm lmmi12.tfm lmmi7.tfm lmmi9.tfm lmmib10.tfm lmmib7.tfm lmsy10.tfm lmsy7.tfm lmsy9.tfm rm-lmr12.tfm rm-lmr7.tfm rm-lmr9.tfm
mkiv lua stats  > fonts load time           - 0.549 seconds 
mkiv lua stats  > luatex banner             - this is luatex, version beta-0.66.0-2011022404 (rev 4088)
mkiv lua stats  > control sequences         - 30119 of 165536
mkiv lua stats  > current memory usage      - 32 MB (ctx: 33 MB)
mkiv lua stats  > runtime                   - 12.996 seconds, 1 processed pages, 1 shipped pages, 0.077 pages/second

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