From stefan_ml at behnel.de  Tue Mar  1 07:20:22 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 01 Mar 2011 07:20:22 +0100
Subject: [lxml-dev] [lxml] Adding top-level comments to an ElementTree
	object
In-Reply-To: <AANLkTimDijNCAP+xcJ_-i85dj3PGbMDYz4WTx3Y2U-0S@mail.gmail.com>
References: <AANLkTimDijNCAP+xcJ_-i85dj3PGbMDYz4WTx3Y2U-0S@mail.gmail.com>
Message-ID: <4D6C9026.6030209@behnel.de>

Tyler Erickson, 28.02.2011 21:14:
> How do you add top-level comments to an ElementTree object?

http://lxml.de/api/lxml.etree._Element-class.html#addprevious

Stefan

From stefan_ml at behnel.de  Tue Mar  1 12:48:41 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 01 Mar 2011 12:48:41 +0100
Subject: [lxml-dev] [lxml] availability of lxml 2.3 windows binaries
In-Reply-To: <AANLkTinPbKS5p-QydR4zaEWOidBtDZdb87v-fFht=9Ea@mail.gmail.com>
References: <loom.20110228T100020-136@post.gmane.org>	<AANLkTimyYtYuPyx8YjFfhvcUz77zZ5rqMEwe25y+zzqg@mail.gmail.com>	<4D6CBCC1.1030808@gmail.com>
	<AANLkTinPbKS5p-QydR4zaEWOidBtDZdb87v-fFht=9Ea@mail.gmail.com>
Message-ID: <4D6CDD19.4060105@behnel.de>

Sidnei da Silva, 01.03.2011 12:28:
> On Tue, Mar 1, 2011 at 6:30 AM, Adam GROSZER wrote:
>> Are those files somewhere in the lxml repo?
>> If not, would be great to have them close to the source...
>
> Indeed. It would be great if someone could pick that up.

Well, lxml is an open source project. I take patches.

Could someone else try these scripts to see how hard it is to get them 
working on a different machine?

Stefan

From tylerickson at gmail.com  Tue Mar  1 20:18:39 2011
From: tylerickson at gmail.com (Tyler Erickson)
Date: Tue, 1 Mar 2011 12:18:39 -0700
Subject: [lxml-dev] [lxml] Adding top-level comments to an ElementTree
	object
In-Reply-To: <4D6C9026.6030209@behnel.de>
References: <AANLkTimDijNCAP+xcJ_-i85dj3PGbMDYz4WTx3Y2U-0S@mail.gmail.com>
	<4D6C9026.6030209@behnel.de>
Message-ID: <AANLkTikw9cis2ib_4S=_4aCrt-CA-0+H5h+=CQ85iVSO@mail.gmail.com>

Stefan,
Thanks, that was what I was looking for...
- Tyler

$ python
Python 2.6.6 (r266:84292, Sep 15 2010, 16:22:56)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
>>> from lxml.builder import E
>>> # construct an Element class using the E-factory
... element = (
...   E.root(
...     E.a('eggs'),
...   )
... )
>>> element.addprevious(etree.Comment('top level comment'))
>>> print etree.tostring(etree.ElementTree(element))
<!--top level comment--><root><a>eggs</a></root>



On Mon, Feb 28, 2011 at 11:20 PM, Stefan Behnel <stefan_ml at behnel.de> wrote:

> Tyler Erickson, 28.02.2011 21:14:
>
>> How do you add top-level comments to an ElementTree object?
>>
>
> http://lxml.de/api/lxml.etree._Element-class.html#addprevious
>
> Stefan
>
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From stefan_ml at behnel.de  Fri Mar  4 16:39:21 2011
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 04 Mar 2011 16:39:21 +0100
Subject: [lxml-dev] [lxml] lxml removes line breaks from XML attributes
In-Reply-To: <AANLkTikY06eAfNKfOSZmu5wXhuGFih1+MgYjQYfifxpR@mail.gmail.com>
References: <AANLkTikY06eAfNKfOSZmu5wXhuGFih1+MgYjQYfifxpR@mail.gmail.com>
Message-ID: <4D7107A9.7010902@behnel.de>

Giovanni Torres, 04.03.2011 10:35:
> Some of you might not be happy with my question. But, I'm dealing with
> an XML file that has line breaks in XML attributes. I use lxml to
> parse the file, run some XPath queries, make changes to it and write
> it back. Unfortunately, lxml removes the line breaks from the
> attributes.
>
> Here is what I mean more clearly:
>
> $ cat example.xml
> <example attr="This is an attribute with several
> break
> lines"/>
>
> $ cat test.py
>
> import sys
> import lxml.etree
>
> xml = lxml.etree.parse(sys.stdin)
> xml.write(sys.stdout)
> print()
>
> $ python test.py<  example.xml
> <example attr="This is an attribute with several  break lines"/>()

This is called "attribute-value normalisation" in the XML spec:

http://www.w3.org/TR/REC-xml/#AVNormalize


> Is there any way I can get lxml to write those line breaks back?

You should escape the newlines in attribute values as presented in the 
spec, i.e. use "#xA;" etc.


> I'm actually not sure if they are even legal. But, they seem to be
> according to this:
>
> http://stackoverflow.com/questions/449627/are-line-breaks-in-xml-attribute-values-valid

Well, technically, the example is "legal", as stated, but it doesn't give 
the requested result.

Stefan