[Zope] Using tal:attributes in XML with non-ASCII characters

[Chris Withers]

Andrew Veitch wrote:
> Error Type: UnicodeDecodeError
> Error Value: 'ascii' codec can't decode byte 0x80 in position 0: ordinal 
> not in range(128)
> 
> If I change the input line to:
> 
> <input name="blah" type="text" tal:attributes="value python:chr(200)" />
> 
> Then this will work in HTML mode but will fail in XML mode.

This all sounds familiar. I remember having loads of fun with 
MailTemplates, which work predominantly in XML mode.

The rules I have from working with them are as follows:

     If content_type is set to text/html, then:

     - any unicodes should be encoded using the character set you
       intend to use for the final mail encoding

     - you are responsible for ensuring that any strings are encoded
       with the correct character set, which should be that used for
       the final mail encoding.

     If content_type is set to anything else:

     - all string-like data inserted into the Mail Template during
       rendering must be in the form of unicode objects.


So, in your case, make sure everything you insert with any tal is a 
unicode object.

hth,

Chris

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