Subject: Re: [xsl] Random UUID in pure XSLT? From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Wed, 11 Nov 2020 20:35:07 -0000 |
Hi Wendell, Dimitre, suggesting the web service option, offers > for $i in 1 to $N > return unparsed-text("https://uuidgen.org/api/v/4") > > I'll try this ... but what prevents an XSLT engine giving me the same result each time? (Oh I see.) Dr. Kay suggested a fix that will block the deterministic-compliance attempts of a hypothetical XPath 3.0+ (or XSLT 2.0) implementation; for $i in 1 to 100 return unparsed-text(concat("https://uuidgen.org/api/v/4?x=", $i)) I say "hypothetical" above, because even Saxon (the 9.9.1.7 versions used in Oxygen) is non-compliant and produces all-different results for this transformation: <xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> <xsl:template match="/"> <xsl:sequence select= "for $i in 1 to 100 return unparsed-text('https://uuidgen.org/api/v/4')"/> </xsl:template></xsl:stylesheet> Interestingly, I have an old version: Saxon 9.1.01, which is compliant to the XSLT 2.0 specification and needs the URL-tail addition in order to get its determinism bypassed. HTH, Dimitre On Wed, Nov 11, 2020 at 12:19 PM Wendell Piez wapiez@xxxxxxxxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi, > > Dimitre, suggesting the web service option, offers > > for $i in 1 to $N > return unparsed-text("https://uuidgen.org/api/v/4") > > I'll try this ... but what prevents an XSLT engine giving me the same > result each time? (Oh I see.) > > Update since yesterday -- I've had some apparent success coding up an > implementation of UUID v4 using fn:random-number-generator() ... results so > far are here (comments welcome): > > > https://github.com/wendellpiez/oscal-tools/blob/issue10-uuid-util/xslt/uuid/r andom-util.xsl > > The functions are deterministic -- they return the same UUID (or UUID > sequence of specified length) for the same seed. In my application, this is > actually a feature. > > Thanks for all the info and help so far this is great! > > Cheers, Wendell > > On Wed, Nov 11, 2020 at 1:32 PM Dimitre Novatchev dnovatchev@xxxxxxxxx < > xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > >> > how can I go about producing random UUIDs, in dozens or hundreds, >> inside an XSLT pipeline, without extension functions in Saxon. >> >> This is actually very easy and doesn't require the use of any extension >> functions: >> >> *unparsed-text("https://uuidgen.org/api/v/4 >> <https://uuidgen.org/api/v/4>")* >> >> or if you need N of them: >> >> *for $i in 1 to $N* >> * return unparsed-text("https://uuidgen.org/api/v/4 >> <https://uuidgen.org/api/v/4>") * >> >> >> >> p >> >> HTH, Dimitre >> >> On Tue, Nov 10, 2020 at 8:36 AM Piez, Wendell A. (Fed) >> wendell.piez@xxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: >> >>> XSL Friends b >>> >>> >>> >>> Today I write from the day job, where I am researching the question of >>> how can I go about producing random UUIDs, in dozens or hundreds, inside an >>> XSLT pipeline, without extension functions in Saxon. The Java randomUUID() >>> function works nicely when itbs available, but I need to distribute the >>> capability for SaxonHE and eventually SaxonJS. >>> >>> >>> >>> We do not have an available implementation of RFC 4122 v4 brandom UUIDb >>> in pure XSLT do we, free to use (and study)? I know the functional nature >>> of the language makes randomness, um, problematic (when isnbt it?), which >>> sometimes means workarounds b thatbs all fine. Indeed so would calling out >>> to a web service if it is known to be reliable. I have thought about >>> handing a list of UUIDs in at runtime, but as I said, there may sometimes >>> be hundreds and perhaps thousands, which makes that approach seem a bit >>> scary. >>> >>> >>> >>> Any thoughts or perspective would be most welcome. >>> >>> >>> >>> Thanks, Wendell >>> >>> >>> >>> >>> >>> >>> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list> >>> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854> (by >>> email) >>> >> >> >> -- >> Cheers, >> Dimitre Novatchev >> --------------------------------------- >> Truly great madness cannot be achieved without significant intelligence. >> --------------------------------------- >> To invent, you need a good imagination and a pile of junk >> ------------------------------------- >> Never fight an inanimate object >> ------------------------------------- >> To avoid situations in which you might make mistakes may be the >> biggest mistake of all >> ------------------------------------ >> Quality means doing it right when no one is looking. >> ------------------------------------- >> You've achieved success in your field when you don't know whether what >> you're doing is work or play >> ------------------------------------- >> To achieve the impossible dream, try going to sleep. >> ------------------------------------- >> Facts do not cease to exist because they are ignored. >> ------------------------------------- >> Typing monkeys will write all Shakespeare's works in 200yrs.Will they >> write all patents, too? :) >> ------------------------------------- >> Sanity is madness put to good use. >> ------------------------------------- >> I finally figured out the only reason to be alive is to enjoy it. >> >> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list> >> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/174322> (by >> email) >> > > > -- > ...Wendell Piez... ...wendell -at- nist -dot- gov... > ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org... > ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell... > XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list> > EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854> (by > email <>) > -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- To avoid situations in which you might make mistakes may be the biggest mistake of all ------------------------------------ Quality means doing it right when no one is looking. ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play ------------------------------------- To achieve the impossible dream, try going to sleep. ------------------------------------- Facts do not cease to exist because they are ignored. ------------------------------------- Typing monkeys will write all Shakespeare's works in 200yrs.Will they write all patents, too? :) ------------------------------------- Sanity is madness put to good use. ------------------------------------- I finally figured out the only reason to be alive is to enjoy it.
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