Syside 0.10.3

[Simonas]

Released on July 20th, 2026.

This version’s Python API documentation.

All Syside Tools

Features

• validation: Improve usage-variation-specialization error message when a variant is a variation
• sema: Skip non-standard documents when looking up standard elements to cache
• parser,formatter: Preserve leading whitespace on line notes on own lines
• conf: Add format.package-closing-note option to control automatic package closing notes
• parser: Clarify that an unexpected non-identifier word is a reserved keyword
• interpreter: Support recursive user function evaluation
• formatter: Treat notes on lines below opening bracket { as children for the purposes of empty bracket formatting
• validation: Add related-feature-conformance lint

Bug Fixes

• model: Implement checkFeatureFeatureMembershipTypeFeaturing
• printer: Fix that ambiguous external synthetic references did not prefix $:: (Forum post: 512)
• sema: Fix that semantic metadata used in filters could be resolved too late
• viz: Fix that decl with short idenfitiers may not print a space to other parts
• fs,osx: Fix that search in large directories would have missing entries
• conf: Fix config parse error locations
• conf: Fix config parse error formatted output
• printer: Fix that SysML connectors without decl ends could skip the required keyword (Forum post: 505)
• model,sema: Defer resolution of unnamed features to avoid wrongly resolving references to inherited features
• sema: Resolve programmatically referenced elements eagerly to match source resolution behaviour (Forum post: 505)

Performance

• gc: Skip externally acquired mutexes to avoid blocking

Modeler and Editor

Features

• lsp: Insert specialization token between implicit names and references if there is none

Bug Fixes

• lsp: Fix that document reverts by an external script could be ignored

Performance

• lsp: Debounce watched file analysis by 1 s to avoid apparent slowdowns when new files are being created continuously
• lsp: Respond to initialize request as soon as the workspace has been populated instead of waiting for analysis to complete

Modeler

Features

• grid views: Add “Visualize view (labs)” → “As table” right-click menu option in editor
• grid views: Add clickable error messages in SysMLv2 views panel
• grid views: Improve matrix view performance
• grid views: Add “Anonymous Element” label for anonymous elements in matrix column/row headers
• grid views: Make SysideViews.sysml version check more robust

Bug Fixes

• visualization: Reload visualization webviews after restarting the Syside Modeler Server, instead of leaving them pointing at the old server port
• grid views: Fix table views incorrectly keeping saving blocked after a model reload
• grid views: Fix a language server deadlock affecting table views
• grid views: Fix table views hanging on “Collecting elements” when loading large models
• Fix missing include paths in syside.toml or settings blocking view loading
• Fix a race condition when installing Syside tools
• Fix a crash when an include or exclude glob pattern contained Unicode characters
• File access errors now report where the offending path came from (for example, a syside.toml include)

Modeler CLI

Features

• cli: Print a short success/failure message in check (Forum post: 516)
• cli: Remove non-project documents from check --stats output if they were not validated at all
• viz: Render inherited elements (nodes, edges, boundary elements)
• viz: Render nested interface/connection/flow nodes with elaboration lines
• viz: Reverse direction on inherited conjugated boundary elements
• viz: Show about statements in annotation declarations
• viz: Use edge direction to inform port and connection point placement side
• viz: Add syside.toml options to toggle inherited element rendering ([viz.filters.<VIEW>].show_inherited_nodes), configure attribute rendering style ([viz.filters.<VIEW>].show_attributes_as), limit displayed compartment items ([viz.compartments].max_entries), and hide inherited compartment items ([viz.compartments].show_inherited_rows)
• viz: Changed default: port specialization edges are now hidden; re-enable with [viz.filters.<VIEW>].show_port_heritage_edges

Bug Fixes

• viz: Improve layout stability
• viz: Fix CLI argument space and special character handling on Windows
• viz: Render self-messages (sequence view)
• viz: Fix incorrect rendering of n-ary edges with more than 2 participants
• viz: Render stakeholders/actors/subject as child nodes (tree mode)
• viz: Render boundary elements as nodes (tree mode)
• viz: Fix bug that caused annotations and metadata to not render
• viz: Fix issues where elements would be rendered on top of each other (sequence view)

Automator

Features

• Extend debug visualizers to Path and QualifiedName, show sequences lens
• Add Lint.related_feature_conformance
• cli: Add syside solver pass-through and [solver] extra

Bug Fixes

• Fix TypeError when using redirect_stdout(StringIO()) with cli.main

Performance

• gc: Disable GC on Python exit