Pre-release

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parasolid-kit

parasolid-kit is an experimental, schema-aware parser for Parasolid X_T and X_B transmit files. Parsing and geometry mapping run in a safe Rust core, while Python users work with immutable typed models.

The project is read-focused and currently pre-alpha. It is intended for file inspection, validation, research, and conversion pipelines where preserving the transmitted structure matters more than silently approximating unsupported data.

Features

  • Inspect X_T and X_B headers without a schema catalog.
  • Parse complete X_T and X_B node streams with the exact caller-provided schema.
  • Reconstruct an unmodified parsed X_B document byte-for-byte.
  • Compare X_T and X_B documents after pointer-index remapping.
  • Map supported topology, analytic geometry, and NURBS records to a typed B-Rep source model.
  • Return structured diagnostics and enforce configurable resource limits.
  • Use the same functionality from Python or a JSON command-line interface.

See format support and limitations before relying on the parser for production data.

Installation

Python 3.10 or newer is required. Install a downloaded wheel with pip:

python -m pip install /path/to/parasolid_kit-0.1.0.dev0-cp310-abi3-PLATFORM.whl

To install from a source checkout, Rust 1.88 or newer is also required:

git clone https://github.com/monozukuri-ai/parasolid-kit.git
cd parasolid-kit
python -m pip install .

The project is not yet claiming a published PyPI release. Once a release is available there, the installation command will be python -m pip install parasolid-kit.

Schema catalogs

Header inspection works without external data. Complete parsing requires the exact sch_*.sch_txt catalog identified by the file's internal schema key. There is no fallback to a nearby version and no inferred replacement for a missing catalog.

Siemens schema catalogs are not included in this repository or its packages. You must provide a catalog from software or an SDK that you are licensed to use and comply with its storage and redistribution terms. The parser reads the catalog in place and does not copy it into the package.

Python example

from pathlib import Path

from parasolid_kit import (
    InMemorySchemaProvider,
    SchemaKey,
    inspect_xb,
    load_schema_catalog,
    map_brep,
    parse_xb,
    write_xb,
)

source = Path("model.x_b")
header = inspect_xb(source)
schema_id = SchemaKey.parse(header.schema_key).provider_schema

catalog = load_schema_catalog(
    Path("/path/to/schema") / f"sch_{schema_id}.sch_txt",
    expected_schema_id=schema_id,
)
provider = InMemorySchemaProvider((catalog,))

document = parse_xb(source, schema_provider=provider)
brep = map_brep(document)

print(header.modeller_version)
print(len(document.nodes), len(brep.bodies), brep.complete)
assert write_xb(document) == document.raw_bytes

map_brep() can return a valid but incomplete model when a well-formed geometry record has no typed mapping yet. Inspect brep.complete and brep.diagnostics instead of assuming that every parsed record has been interpreted.

Command line

# Header inspection does not need a schema catalog.
parasolid-kit inspect model.x_b

# Complete parsing and comparison require the exact catalog in --schema-dir.
parasolid-kit parse model.x_t --schema-dir /path/to/schema
parasolid-kit parse model.x_b --schema-dir /path/to/schema --brep
parasolid-kit compare model.x_t model.x_b --schema-dir /path/to/schema

Reports are JSON. Exit status is 0 for success or equivalent documents, 1 for a valid comparison that found differences, and 2 for input, schema, or parse errors. python -m parasolid_kit provides the same interface.

Documentation

Project boundaries

parasolid-kit does not parse native CAD containers such as iCAD .icd, CAD assembly structures, occurrence transforms, visibility, or appearance. A format-specific adapter can extract a bounded X_T/X_B payload and pass it to this package without making the parser depend on that CAD product.

The package has no runtime dependency on a CAD product, geometry kernel, or OpenCascade binding. It does not bundle Siemens schema data or proprietary CAD files.

License

This project is licensed under the MIT License.

Project links

Data verified by PyPI on Aug 29, 2026
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Avatar for nekanat from gravatar.com nekanat

GitHub Statistics

Data verified by PyPI on Aug 29, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.10

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