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Re: issue-77 Rule parsing precedence

From: Felix Sasaki <fsasaki@w3.org>
Date: Fri, 11 Jan 2013 13:35:19 +0100
Message-ID: <50F00707.9030109@w3.org>
To: Mārcis Pinnis <marcis.pinnis@Tilde.lv>
CC: "public-multilingualweb-lt@w3.org" <public-multilingualweb-lt@w3.org>, Pēteris Ņikiforovs <peteris.nikiforovs@Tilde.lv>, Andis Lagzdiņš <andis.lagzdins@Tilde.lv>
Hi Marcis,

at
http://www.w3.org/TR/2012/WD-its20-20121206/#selection-global
sec 5.2.1 we say "The rules sections are to be read in document order". 
For HTML that would mean: first rules in "head", then in "body", if 
there are e.g. "div" in body with "rules" in them first the first "div", 
then the second etc.

Should we clarify in 5.2.1 that this also applies to HTML?

Best,

Felix

Am 11.01.13 12:19, schrieb Mārcis Pinnis:
>
> Hi Felix, all,
>
> One more thing that I forgot to add:
>
> As rules only SHOULD (not MUST) be in the <head> tag of HTML 
> documents, this also means that rules can be defined within <body> 
> tags (which seems obvious and is a common practice to speed-up Web 
> pages...).
>
> This creates another question: does this affect the precedence?
>
> That is, consider the previous situation, but now with some <script> 
> tags in <body>:
>
> <head>
>
> <link ...
>
> <script ...
>
> <script ...
>
> <link ...
>
> </head>
>
> <body>
>
> <script ...
>
> <script ...
>
> </body>
>
> When rendering Web pages browsers read the <head> first and the <body> 
> as the last part.
>
> So ... obviously this should be the same with ITS rules (or not? Read 
> further for: why this creates a limitation)?!
>
> I am asking this as we had an internal discussion whether inline rules 
> should be prioritized over external rules.
>
> I myself think that a top-down approach (the last ones in the document 
> are overriding previous ones) is more appropriate and also allows a 
> sort of flexibility in the document <head>.
>
> However, there is also a limitation – if prioritization is a top-down 
> one, the external rules can never override global rules that are in 
> <body> tags! Please correct me if I am mistaken here?!
>
> Best regards,
>
> Mārcis ;o)
>
> *From:*Felix Sasaki [mailto:fsasaki@w3.org]
> *Sent:* Friday, January 11, 2013 10:55 AM
> *To:* Mārcis Pinnis
> *Cc:* public-multilingualweb-lt@w3.org; Pēteris Ņikiforovs; Andis Lagzdiņš
> *Subject:* issue-77 (Re: ACTION-334 - check use of "quote" and "val")
>
> Hi Mārcis, all,
>
> I filed an issue for this since it may need a change in the draft. At
> http://www.w3.org/TR/2012/WD-its20-20121206/#html5-selection-precedence
> we say "2. global selection in documents "(using mechanism of external 
> global rules or inline global rules)", but we don't say what should 
> happen if both external and inline rules are present. We probably 
> should clarify this. While doing this we might also try to resolve the 
> comment from Chase and Kevin, see
> https://www.w3.org/International/multilingualweb/lt/track/issues/70
>
> Best,
>
> Felix
>
> Am 11.01.13 09:35, schrieb Mārcis Pinnis:
>
>     Hi Felix and others,
>
>     Just a small clarification (yes/no) question regarding rule
>     precedence.
>
>     Just to get some context:
>
>     ITS 2.0 in http://www.w3.org/TR/its20/#html5-global-rules specifies:
>
>     Link to external global rules is specified in |href|attribute of
>     |link|element, with the link relation |its-rules|.
>
>     and also:
>
>     Inline global rules MUST <http://www.w3.org/TR/its20/#rfc2119> be
>     specified inside |script|which has |type|attribute with the value
>     |application/its+xml|. The |script|element itself SHOULD
>     <http://www.w3.org/TR/its20/#rfc2119> be child of |head|element.
>     Comments MUST NOT <http://www.w3.org/TR/its20/#rfc2119> be used
>     inside global rules. Each |script|element MUST NOT
>     <http://www.w3.org/TR/its20/#rfc2119> contain more than one
>     |rules|element.
>
>     that is, we may have two types of rules – inline within script
>     elements and external .
>
>     So ... now the question:
>
>     If we have several inline and external rules, for instance:
>
>     <link ...
>
>     <script ...
>
>     <script
>
>     <link ...
>
>     Do we ignore that the script rules are inline (that is, there is
>     no prioritization between inline and external rules other than the
>     order in which they are defined within the HTML head tag) and do
>     the last <link /> rules override any previous ones in the case of
>     rule overlapping (seems obvious, however, I could not find a
>     precise clarification of this in the current ITS 2.0 version)?
>
>     Yes – the last one overrides all previous.
>
>     no – it does override the first external rules, but does not
>     override the script rules.
>
>     Best regards,
>
>     Mārcis ;o)
>
Received on Friday, 11 January 2013 12:35:44 UTC

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