xmlchainatt and xmllastatt

xmlchainatt and xmllastatt

[Hans van der Meer]

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I found at best an inconsistency in the xml-mkiv manual and at its worst an omission in the code.

I must conclude that \xmllastatt is not delivering the attribute retrieved with \xmlchainatt and that \xmllastatt seems restricted to calls of the \xmlatt family. This put me on the wrong foot for a while, because I understood the manual otherwise.
Vide the minimal example given.

dr. Hans van der Meer



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Fwd: xmlchainatt and xmllastatt

[Hans van der Meer]

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Sorry, wrong button. Now with the attachments.

> Begin forwarded message:
> 
> From: Hans van der Meer <havdmeer@ziggo.nl>
> Subject: xmlchainatt and xmllastatt
> Date: 11 September 2018 at 10:13:25 CEST
> To: NTG ConTeXt <ntg-context@ntg.nl>
> 
> I found at best an inconsistency in the xml-mkiv manual and at its worst an omission in the code.
> 
> I must conclude that \xmllastatt is not delivering the attribute retrieved with \xmlchainatt and that \xmllastatt seems restricted to calls of the \xmlatt family. This put me on the wrong foot for a while, because I understood the manual otherwise.
> Vide the minimal example given.
> 
> dr. Hans van der Meer
> 
> 

met vriendelijke groet
dr. Hans van der Meer


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% test chainttribute failure.
\startxmlsetups demo:chainatt
	\xmlsetsetup{#1}{root|node}{demo:chainatt:*}
\stopxmlsetups
\xmlregisterdocumentsetup{demo}{demo:chainatt}
\startxmlsetups demo:chainatt:root
	root: attribute test = \xmlatt{#1}{test} --- xmllastatt = \xmllastatt\crlf
	root: chainattribute test = \xmlchainatt{#1}{test} --- xmllastatt = \xmllastatt\crlf
	\xmlall{#1}{*}
\stopxmlsetups
\startxmlsetups demo:chainatt:node
	First level child:\crlf
	node: attribute test = \xmlatt{#1}{test} --- xmllastatt = \xmllastatt\crlf
	node: chainattribute test = \xmlchainatt{#1}{test} --- xmllastatt = \xmllastatt\crlf
\stopxmlsetups
\startbuffer[chainatt]
<root test="abc">
  <node/>
</root>
\stopbuffer
\starttext
\currentdate-\currenttime\quad\ConTeXt-version=\contextversion\blank
The manual xml-mkiv page 22 on \tex{xmlchainatt} reads:\crlf
"returns the value of attribute NAME or empty if no such attribute exists; backtracks till a match is found"\crlf
And next on \tex{xmllastatt} it reads:\crlf
"returns the last attribute found (this avoids a lookup)"\blank
The last statement cannot be true because the attribute returned by \tex{xmlchainatt} is not retrieved with \tex{xmllastatt}, witness the following example.\blank
\xmlprocessbuffer{demo}{chainatt}{}\blank
\stoptext

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