2459 2005-11-04 16:44:50 +0000 [Serialization] Phases of Character Expansion 2006-02-16 15:56:59 +0000 1 1 1 Unclassified XPath / XQuery / XSLT Serialization 1.0 Candidate Recommendation PC Windows XP CLOSED FIXED P2 normal --- 1 mike scott_boag public-qt-comments oldest_to_newest 7043 0 mike 2005-11-04 16:44:50 +0000 Serialization section 4, list item 2, contains the rule: The substitution processes that apply are listed below, in priority order: a character that is handled by one process in this list will be unaffected by processes appearing later in the list, except that a character affected.... My question is, what does "handled" mean here? Does it mean the same as "affected"? Consider this example (a Saxon bug report today). The result tree contains <a href="mailto:sales@backbase.com">sales@backbase.com</a> and there is a character map that translates "@" to "(at)" Saxon is doing the character mapping for the text node but not for the attribute node, because the characters in the attribute node are all "handled" by the URI escaping phase, even though they are unchanged by that phase. Is this a correct interpretation? It isn't an interpretation that makes much sense for this use case, and I can't really think of a use case where it does make sense. So perhaps "handled" should be "affected", or even "altered". This leads me to question these rules from first principles. The rules have become increasingly messy. Let's look at all the interactions between phases: for reference these are a URI escaping b character mapping c unicode normalization d CDATA sections e ampersand escaping Looking at all possible pairs of phases, let's ask the question "should a character that's changed by the first phase also be changed by the second" ab - unlikely to affect practical use cases ac - makes no difference (we have recently added a new rule to normalize before URI escaping) ad - makes no difference ae - makes no difference bc - probably yes, though currently no bd - makes no difference (we have a special rule here that elements specified as cdata-section-elements are not affected by character mapping) be - definitely no cd - definitely yes (the exception to the general rule is already stated) ce - definitely yes (the exception to the general rule is already stated) de - definitely no This is far from the blanket "no" that the general rule implies. I think we could make the whole thing a lot simpler by inverting the general rule, so that characters output by one phase act as input to the next, with stated exceptions: (1) an & or < character produced as a result of string replacement in a character map is not ampersand-escaped in step (e) (2) steps (d) and (e) are alternatives, rather than being sequential: a text node is either processed by (d) or by (e). Michael Kay previously raised at http://lists.w3.org/Archives/Member/w3c-xsl-query/2005Oct/0010.html 8289 1 407 joannet 2006-02-16 15:43:20 +0000 Created attachment 407 Section 4 Phases of Serialization 8290 2 joannet 2006-02-16 15:55:44 +0000 The XSL and XQuery working group accepted the proposed revision (view attachment in this bug report) to section 4 of the serialization specification on Feb. 1, 2006. The character expansion phase has been rewritten so that the sequence of processes to be applied are unambiguous and should produce a reasonable result. 407 2006-02-16 15:43:19 +0000 2006-02-16 15:43:19 +0000 Section 4 Phases of Serialization serialization.html text/html 15185 joannet 77u/PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz48aHRtbCBsYW5nPSJlbiI+ PGhlYWQ+PHRpdGxlPlhTTFQgMi4wIGFuZCBYUXVlcnkgMS4wIFNlcmlhbGl6YXRpb24gPC90aXRs ZT48c3R5bGUgdHlwZT0idGV4dC9jc3MiPg0KY29kZSAgICAgICAgICAgeyBmb250LWZhbWlseTog bW9ub3NwYWNlOyB9DQoNCmRpdi5jb25zdHJhaW50LA0KZGl2Lmlzc3VlLA0KZGl2Lm5vdGUsDQpk aXYubm90aWNlICAgICB7IG1hcmdpbi1sZWZ0OiAyZW07IH0NCg0KZGl2Lmlzc3VlDQpwLnRpdGxl ICAgICAgICB7IG1hcmdpbi1sZWZ0OiAtMmVtOyB9DQoNCm9sLmVudW1hciAgICAgIHsgbGlzdC1z dHlsZS10eXBlOiBkZWNpbWFsOyB9DQpvbC5lbnVtbGEgICAgICB7IGxpc3Qtc3R5bGUtdHlwZTog bG93ZXItYWxwaGE7IH0NCm9sLmVudW1sciAgICAgIHsgbGlzdC1zdHlsZS10eXBlOiBsb3dlci1y b21hbjsgfQ0Kb2wuZW51bXVhICAgICAgeyBsaXN0LXN0eWxlLXR5cGU6IHVwcGVyLWFscGhhOyB9 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