jmd-format 0.5.0

JMD (JSON Markdown) — structured data format for LLM-driven infrastructure

jmd-format — Python Reference Implementation

Python reference implementation of the JMD specification (v0.4). Includes a C-accelerated parser and serializer, plus lossless XML↔JMD conversion.

Installation

Install the latest version directly from GitHub:

pip install git+https://github.com/ostermeyer/jmd-impl.git

Or pin a specific release:

pip install git+https://github.com/ostermeyer/jmd-impl.git@v0.4

Pre-built wheels for Linux, macOS, and Windows are attached to each GitHub Release and can be installed directly:

pip install https://github.com/ostermeyer/jmd-impl/releases/download/v0.4/jmd_format-0.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

The C extensions are built automatically during installation if a C compiler is available. If not, the pure-Python fallback is used transparently.

Quick Start

from jmd import parse, serialize

data = parse("""
# Order
id: 42
status: pending

## customer
name: Anna Müller
email: [e-mail]
""")

print(data)
# {'id': 42, 'status': 'pending', 'customer': {'name': 'Anna Müller', 'email': '[e-mail]'}}

print(serialize(data, label="Order"))

Document Modes

from jmd import jmd_mode, JMDQueryParser, JMDSchemaParser, JMDDeleteParser, parse_error

# Detect mode without full parse
mode = jmd_mode(source)   # 'data' | 'query' | 'schema' | 'delete'

# Query by Example (#?)
query = JMDQueryParser().parse("#? Order\nstatus: pending")

# Schema (#!)
schema = JMDSchemaParser().parse("#! Order\nid: integer readonly\nstatus: string")

# Delete (#-)
delete = JMDDeleteParser().parse("#- Order\nid: 42")

# Error (# Error)
error = parse_error("# Error\nstatus: 404\ncode: not_found\nmessage: Not found")

Streaming

from jmd import jmd_stream

for event in jmd_stream(source):
    print(event)

XML Mapping

Lossless conversion between data XML and JMD (requires lxml):

from jmd.xml import xml_to_jmd, jmd_to_xml

jmd_source = xml_to_jmd(xml_bytes_or_str)  # XML → JMD string
xml_output  = jmd_to_xml(jmd_source)        # JMD → XML bytes

Targets data XML — OOXML (WordprocessingML, DrawingML, SpreadsheetML), SOAP, XBRL, XRechnung, and similar formats. Mixed-content XML (ODF, XHTML) is out of scope.

See the JMD over XML companion specification for the full mapping rules.

C Extensions

Build manually if needed:

python build_ext.py build_ext --inplace

Specification

See jmd-spec for the full format specification, benchmark results, and design documentation.

License

Licensed under the Apache License, Version 2.0. See LICENSE.

The JMD format specification is licensed separately under CC BY 4.0.