I see that my attachment is missing, so I'll try again. And for extra I'll drop the code her in the mail too. Here we go: ------------------------------------------------------------------------------ [1] "test.xqm" import module namespace BASE-TYPE = "BASE-TYPE" at "./BASE-TYPE.xqm" ;

let $object := 12 return $object => $BASE-TYPE:method_1( ) -------------------------------------------------------------------------- [2] "BASE-TYPE.xqm" module namespace BASE-TYPE = "BASE-TYPE" ; import module namespace SUPER-TYPE = "SUPER-TYPE" at "./SUPER-TYPE.xqm" ;

declare variable $BASE-TYPE:method_1 := BASE-TYPE:method_1#1 ; declare %private function BASE-TYPE:method_1( $i) { if ( $i > 0) then ( $i,( $i - 1) => $SUPER-TYPE:method_1( )) else () } ; ----------------------------------------------------------------------- [3] "SUPER-TYPE.xqm" module namespace BASE-TYPE = "SUPER-TYPE" ; import module namespace SUPER-TYPE = "SUPER-SUPER-TYPE" at "./SUPER-SUPER-TYPE.xqm" ;

declare variable $BASE-TYPE:method_1 := BASE-TYPE:method_1#1 ; declare %private function BASE-TYPE:method_1( $i) { if ( $i > 0) then ( $i,( $i - 1) => $SUPER-TYPE:method_1( )) else () } ; ------------------------------------------------------------------------------------------------------------------------- [4] "SUPER-SUPER-TYPE.xqm" module namespace BASE-TYPE = "SUPER-SUPER-TYPE" ; import module namespace SUPER-TYPE = "BASE-TYPE" at "./BASE-TYPE.xqm" ;

declare variable $BASE-TYPE:method_1 := BASE-TYPE:method_1#1 ; declare %private function BASE-TYPE:method_1( $i) { if ( $i > 0) then ( $i,( $i - 1) => $SUPER-TYPE:method_1( )) else () } ; --------------------------------------------------------------------------------------------------------------------------

Yes, the content of the module-files is identical except for the imported module-file.

Best, Rob

Op 21-10-2020 12:00 schreef basex-talk-request@mailman.uni-konstanz.de:

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Today's Topics:

1. recursively used variables (Rob Stapper)

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Message: 1 Date: Tue, 20 Oct 2020 17:19:36 +0200 From: Rob Stapper r.stapper@lijbrandt.nl To: "basex-talk@mailman.uni-konstanz.de" basex-talk@mailman.uni-konstanz.de Subject: [basex-talk] recursively used variables Message-ID: aa8b70e7-12e7-11eb-8513-005056998788@smtp.kpnmail.nl Content-Type: text/plain; charset="utf-8"

Hi,

For those who follow this discussion and find it an interesting case, hereby an example of the problem I?m facing.

The example throws an error: Static variable depends on itself: ??

The example concerns a 3-step cyclic construct: ?BASE-TYPE.xqm? -> ?SUPER-TYPE.xqm? -> ?SUPER-SUPER-TYPE.xqm? -> ?BASE-TYPE.xqm?, starting of from ?test.xq?.

I need the solution to comply with four rules:

• The module-functions must be %private and may only be addressed from outside the module through a public module-$variable. This way inheritance between modules can simply be implemented by the use of variables.
• The internal structure of a module-function must be completely hidden for use outside the module. So if the module-function calls another function it is not allowed to pass this called upon function or its name in the module-function?s parameterlist. That is why I can?t use Leo solution here.
• The 3-step cycle structure can not be changed.
• I need a generic solution.

The solution is of course that it just works; Christian is having a look at it, but I thought it an interesting enough case to share and maybe somebody comes up with an solution that does complies to these rules as a temporary ? work around. My solution for the time being is violating my first rule.

Have fun, Rob Stapper

PS for using the example, just extract it and copy the extracted directory in BaseX?s src-directory. Start "test.xq? from within BaseX and it should work

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