Re: Use of ID attribute types.
"Rodriguez, Sergio" <srodriguez@c...> writes: > 1) As far as I know the ID attributes have a scope of uniqueness within a > document instance, that is, these are unique in the whole document. Is > there a mechanism, probably an extension of XML, where I can define the > scope of ID attributes whitin a document fragment using a scheme language? W3C XML Schema  provides the key/unique/keyref mechanism, which includes scoping of the sort you require. > (I know that this I can't achieve it using a DTD, right?) e.g. the > following example would be valid... > > <root> > <element-one id-attribute="ALUX" /> <!-- use the same ID --> > <element-two id-attribute="TIKAL" /> > <element-three id-attribute="ALUX" /> <!-- use the same ID --> > </root> That's presumably an over-simplified exampl -- what you can certainly do is <root> <context> ... <element-one key-attribute="ALUX" /> <!-- use the same ID --> ... </context> <context> ... <element-two key-attribute="TIKAL" /> ... </context> <context> ... <element-three key-attribute="ALUX" /> <!-- use the same ID --> ... </context> </root> > 2) The use of XML namespace in ID attributes: if I define two namespaces > within a document, and those namespace include some attributes where their > names are the same and they are ID attributes too... then I could have the > same ID values which would be semantically different, right? and thus, they > would be different ID values (I hope I have expressed it right). Example: > > <root xmlns:a="some-URI" xmlns:b="another-URI"> > <element-one a:id-attribute="ALUX" /> > <element-two a:id-attribute="TIKAL" /> > <element-three b:id-attribute="ALUX" /> <!-- this would be a different ID > value, because it belongs to another namespace. Is this correct? --> > </root> No. IDs are not in namespaces. All IDs, whatever their attribute name, must be unique. Note W3C XML Schema doesn't change ID/IDREF -- it provides a new alternative which is more flexible and more powerful. ht  http://www.w3.org/XML/Schema -- Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh Half-time member of W3C Team 2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@c... URL: http://www.ltg.ed.ac.uk/~ht/ [mail really from me _always_ has this .sig -- mail without it is forged spam]
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