[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: What is the best way to cast integer to string in
Thanks a lot Jeni and Andrew, > This is a good example of what I meant during my talk at XML Europe > about life getting harder for XSLT users because of the strong typing > in XPath 2.0. XPath 2.0 allows implicit casting: > > 1. from xdt:untypedAtomic (the type of untyped nodes) to any atomic > type > > 2. from any atomic type to its base type (up the atomic type > hierarchy) > > 3. from xs:decimal (and its subtypes) to xs:float or xs:double and > from xs:float to xs:double > > As you say, it is possible to cast values of most types into a string > (exceptions are xs:QName and xs:NOTATION), but in terms of the type > hierarchy used by XPath 2.0, it is not the case that every type is > derived from xs:string. (I guess you're aware of the recent XML-Dev > discussion on this topic.) So you have to perform the casting > explicitly. Do any examples exist when such implicit casting would be dangerous/counter-intuitive? If not, then it would be very useful to allow implicit casting to string. In C++ one can specify a constructor that takes a single argument og another type, e.g.: class complex { double re, im; public: complex (double r) : re(r), im(0) {} }; Then the programmer simply writes: complex a = 7; instead of complex a = complex(7); In cases like the current one I think such "conversion constructors" should be specified in the XPath data model. This makes writing and understanding a program much more easier. > > > 2. My current solution is to use > > > > string(position()) > > > > Is this the best/recommended solution? > > Yes. For atomic values like the integer returned by position(), it > returns the same as xs:string(position()); the latter is just longer > and requires an extra namespace declaration. Thanks! ===== Cheers, Dimitre Novatchev. http://fxsl.sourceforge.net/ -- the home of FXSL XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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