HiLang 2.6.2

• .NETStandard 2.0

  • FSharp.Core (>= 10.1.301)
  • FsLexYacc (>= 11.3.0)
  • FsLexYacc.Runtime (>= 11.3.0)
  • Hiperspace (>= 2.6.2)
  • Microsoft.Bcl.HashCode (>= 6.0.0)
  • Microsoft.CodeAnalysis.CSharp (>= 5.3.0)

https://www.cepheis.com/hiperspace/20260706
# Overview
This release is a significantly enhances support for [XML Schema](https://www.w3.org/XML/Schema), an introduces generated mapping for [ISO20022](https://www.iso20022.org/) messages.

ISO20022 includes a large family of 761 XSD schema files comprising 39954 separate type definitions (*many of which are duplicated in each schema file, but some specific domain variations*).
As a *proof-of-principle* the message schema has been mapped *as-is* with payments messages augmented to show how a **Graph** and **Cube** functionality can be added with minimal changes to store messages in hiperspace.  *Messages* stored in hiperspace are *naturally* compressed from the XML or JSON source using protobuf encoding that replaces type names with the equivalent  **#id** and native types instead of text encoding.

## Hilangc changes
Import of XSD schema has been added to the command-line tool

|Option |┃| Notes|
|-|-|-|
|--xsd|┃| Import the XML schema file (.xsd) to an equivalent hilang model |
| --xn|┃| Set the XML schema tag for all imported elements |
| --xe|┃| Import references to a list of names as *entities*|
| --xs|┃| Import references to a list of names as *segments*|
| --xa|┃| Import references to a list of names as *aspects*|
| --xt|┃| Import references to a list of names as abstract *types* - the default is *values*|

## Hilang changes
The  directive `%reference (domain.schema.dll);`  imports *elements* from pre-compiled domain schema [all.hilang](https://github.com/channell/Hiperspace.ISO20022/blob/main/all/all.hilang) uses the reference import to build a consolidated ISO20022 schema including element definitions from each domain specific models {acmt, admi, auth, caaa, caad, caam, cafc, cafm, cafr, cain, camt, canm, casp, casr, catm, catp, colr, fxtr, head, pacs, pain, reda, remt, secl, seev, semt, sese, setr, trck, tsin, tsmt, tsrv}

The directive `%annotations;` has been added to simplify maintenance of XSD mapping. The code
```
@XmlNameSpace ("urn:iso:std:iso:20022:tech:xsd:pain.001.001.12"), ValidationCheck
entity ISO20022.Pain001001.CustomerCreditTransferInitiationV12 #35044
(
   @XmlElement GrpHdr             : ISO20022.Pain001001.GroupHeader114 #1,
)
{
   @XmlElement SplmtryData        : List<ISO20022.Pain001001.SupplementaryData1> #2,
};
```
could be modeled as
```
@XmlNameSpace ("urn:iso:std:iso:20022:tech:xsd:pain.001.001.12"), ValidationCheck
entity ISO20022.Pain001001.CustomerCreditTransferInitiationV12 #35044
{
   @Key, XmlElement GrpHdr             : ISO20022.Pain001001.GroupHeader114 #1,
   @XmlElement SplmtryData             : List<ISO20022.Pain001001.SupplementaryData1> #2,
};
```
to transform the the `GrpHdr` element of `ISO20022.Pain001001.CustomerCreditTransferInitiationV12` from a *value* to a *key* without reordering the memvbers of the element.  
This is intended to simplify the tracking of a golden-source of model using code change-control tools

## Hiperspace changes
Various Hiperspace structures have been changed from `struct` to `class` to avoid stack-space issues with huge models.
`netstandard2.0` has been added as a target for Hiperspace assembly to enable meta-data definitions to be read by Hilang during compilation (or generation using *hilangc*)

Interface functions that were marked as Obsolete in earlier releases have been removed.

Additional Transactional versions of the `Bind`,  `Get` and `Find` functions have been added, initially using the old functions. These functions take a **MVCC Transaction** reference has an additional parameter and a [DurableType](https://github.com/channell/Hiperspace/blob/master/src/Hiperspace/DurableType.cs) to allow the functions to be used for:

|Type|┃|Notes|
|-|-|-|
|Elements |┃| Entities, Segments, Aspects |
|Versioned|┃| Versioned Entities, Segments, Aspects|
|MetaModel|┃| dictionary that ensures that Hiperspaces cannot be used by incompatible clients|
| VectorSpace|┃| VectorSpace token lists for geospatial and nearest neighbor search|
| Sequences|┃| Sequence numbers |
| Transaction|┃| {start, end, reference} elements for MVCC |
|**MetaMap**|┃| protobuf transformation structure for Meta-Model compliant serialisation of elements|
|**Fingerprint**|┃| To avoid re-generation of meta-map when Hiperspace has been reopened by a pre-validated client|

Hiperspace `Find` will search for hiperspace using  the *key* or *index* values.  The new function extends the search parameters to include a collection of values that are not part of a *key/index* to reduce the number of elements returned from hiperspace to pre-filter elements close to source.