Thanks, I think this is the best version at last time

Also, we can do better that

That is a quick analize of a log.
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rtl
Unresolved links: 203
fcl
Unresolved links: 603
fcl-res
Unresolved links: 165
laz-utils
Unresolved links: 15
lcl
Unresolved links: 365
At first you should enable a new option for fpdoc.
The option is "--fallback-seealso-links" - Simplify seealso links by exluding last link level for see also.
For a build_lcl_docs, that option is activated as the "--arg --fallback-seealso-links"
That will reduce the count of the unresolved links at several times. And we will see wrong descriptions links only.
For lcl package I have got only 13 unresolved links with that option.
Warning: Target ID of <link> in unit "unicodedata", element "#rtl.unicodedata.TUInt24Rec.implicit(TUInt24Rec):Word", is unknown:
- I think that it is unresolved by FPDoc or the fpc-src - construction implicit(TUInt24Rec).
Warning: Target ID of <link> in unit "?", element "How to implement a new resource class", is unknown: "resource.TAbstractResource.SetDescOwner"
Warning: Target ID of <link> in unit "?", element "How to implement a new resource class", is unknown: "resource.TAbstractResource.ChangeDescTypeAllowed"
Warning: Target ID of <link> in unit "?", element "How to implement a new resource reader", is unknown: "resource.TAbstractResourceReader.GetDescription"
Warning: Target ID of <link> in unit "?", element "How to implement a new resource reader", is unknown: "resource.TAbstractResourceReader.CheckMagic"
Warning: Target ID of <link> in unit "?", element "How to implement a new resource reader", is unknown: "resource.TAbstractResourceReader.Load"
#fcl-res.machowriter.EMachOResourceWriterSymbolTableWrongOrderException
Warning: Target ID of <link> in unit "?", element "Introduction", is unknown: "Basic Usage"
Warning: Target ID of <link> in unit "?", element "Basic Usage", is unknown: "resource.TResources"
- I don`t know what that is. I think a wrong structure of the documentation xml.
ERROR Tree Class information: #fcl.streamex.TStreamHelper
- Not exist a tree class information for the helpers. A Class tree is not displayed for helpers. That is my todo.