https://forum.plantuml.net/9972/component-diagrams-please-direction-token-corresponding?show=9972#q9972 say that in 2019 the beta version changed the id to "a->b"
But < and> are not allowed as characters in id.
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/id says they should be XML 1.0 compliant.
https://www.w3.org/TR/REC-xml/#id says they must match the Name production
https://www.w3.org/TR/REC-xml/#NT-Name says:
The ASCII symbols and punctuation marks, along with a fairly large group of Unicode symbol characters, are excluded from names because they are more useful as delimiters in contexts where XML names are used outside XML documents; providing this group gives those contexts hard guarantees about what cannot be part of an XML name.
| [4] | NameStartChar | ::= | ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF] |
| [4a] | NameChar | ::= | NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040] |
| [5] | Name | ::= | NameStartChar (NameChar)* |
So this isn't a problem with display in a web browser, since they are so lenient.
But its an issue when I try to import the generated document in Inkscape, the lines are ignored.
My work around is to post process the file and replace "->" with "-to-".
