[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: MicroXPath proposal
Did I miss something If the current data model is the one defined at [1] [[ Data model. The MicroXML specification should define a single, normative data model for MicroXML documents. It should be as simple possible: * The model for a MicroXML document consists of a single element. * Comments are not included in the normative data model. * An element consists of a name, attributes and content. * A name is a string. It can be split into two parts: a prefix, which is either empty or ends in a colon, and local name. * Attributes are a map from names to Unicode strings (sequences of Unicode code-points). * Content is an ordered sequence of Unicode code-points and elements. * An element probably also needs to have a flag saying whether it's an empty element. This is unfortunate but HTML5 does not treat an empty element as equivalent to a start-tag immediately followed by an end-tag: elements like <br> cannot have end-tag, and elements that can have content such as <a> cannot use the empty element syntax even if they happen to be empty. (It would be really nice if this could be fixed in HTML5.) ]] It means you have also attribute and text nodes Xmlizer [1] http://blog.jclark.com/2010/12/microxml.html On Thu, Jan 13, 2011 at 7:12 AM, John Cowan <johnwcowan@gmail.com> wrote: > > I've been thinking a lot about MicroXML, MicroXSD, MicroRNG, etc., and > I thought I'd take a stab at a MicroXPath. This is intended to be, > like the others, the simplest thing that could possibly work. > However, I'm not a frequent XPath user, so I may have put together > something that is *too* simple to work. So I'm posting here for > comments. (I'm using this address because xml-dev drops posting from > my permanent cowan@ccil.org address on the floor, for some reason). > > One principle is that since elements are the only kind of node in the > MicroXPath data model, XPath expressions return only lists of > elements. Another is that 100% compatibility with XPath 1.0 isn't > essential, since most XPath expressions are fairly transient compared > to XML documents or schemas. > > So here's what I've got. The only kind of expression is a location > path. Location paths can be absolute or relative, and their steps can > be separated by either / or //. A path step is an element name, star, > dot, or dot-dot. > > Only one predicate is allowed per step, and it has to take one of > these eight forms: > > 1) a literal number > > 2) last() > > 3) location-path="string" > > 4) @name="string" > > 5) location-path/@name="string" > > 6) @@name="string" > > 7) location-path/@@name="string" > > 8) function(.) > > @@ means "inheritable attribute", and is provided for brevity and > convenience. In form 8, the function name is provided externally to > XPath (there are no built-in functions except last()), and accepts the > current element node and returns a boolean value. This is the > programmatic escape from MicroXPath that allows complex predicates. > > What's missing? What can I take out? Comments solicited. > > -- > John Cowan http://www.ccil.org/~cowan <cowan@ccil.org> > You tollerday donsk? N. You tolkatiff scowegian? Nn. > You spigotty anglease? Nnn. You phonio saxo? Nnnn. > Clear all so! `Tis a Jute.... (Finnegans Wake 16.5) > > _______________________________________________________________________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@lists.xml.org > subscribe: xml-dev-subscribe@lists.xml.org > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php >
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