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More XPath function support

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* `count`, `name`, `contains`, `not`, as defined in [xpath 1.0](https://www.w3.org/TR/xpath-10)
  * `deref`, `derived-from` and `derived-from-or-self` from RFC7950 Section 10.
    * in particular in augment/when statements
  * Improved error handling
    * Verification of XPath functions is done at startup when yang modules are loaded, not when XPaths are evaluated.
    * Separation of "not found" and "not implemented" XPath functions
    * Both give a fatal error (backend does not start).
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Olof hagsand 2020-09-23 15:35:01 +02:00
parent 2994d2f9a9
commit 21ac47915b
14 changed files with 715 additions and 132 deletions
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CHANGELOG.md
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# Clixon Changelog
* [4.8.0](#480) Expected: October 2020
* [4.8.0](#480) Expected: 15 October 2020
* [4.7.0](#470) 14 September 2020
* [4.6.0](#460) 14 August 2020
* [4.5.0](#450) 12 May 2020
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* [3.3.1](#331) June 7 2017
## 4.8.0
Expected: October 2020
Expected: 15 October 2020
### New features
* Added support for the following XPATH functions:
* `contains`, see https://www.w3.org/TR/xpath-10
* `derived-from` and `derived-from-or-self`
* in particular in augment/when statements as shown in eg RFC 7950.
* `count`, `name`, `contains`, `not`, as defined in [xpath 1.0](https://www.w3.org/TR/xpath-10)
* `deref`, `derived-from` and `derived-from-or-self` from RFC7950 Section 10.
* in particular in augment/when statements
* Improved error handling
* Verification of XPath functions is done at startup when yang modules are loaded, not when XPaths are evaluated.
* Separation of "not found" and "not implemented" XPath functions
* Both give a fatal error (backend does not start).
### API changes on existing protocol/config features
Users may have to change how they access the system
* Not implemented XPath functions will cause a backend exit on startup, instead of being ignored.
### Minor changes
* Added filterexpr to xpath
## 4.7.0
14 September 2020