xmlschema 4.0.1

Features

This library includes the following features:

• Full XSD 1.0 and XSD 1.1 support

• Building of XML schema objects from XSD files

• Validation of XML instances against XSD schemas

• Decoding of XML data into Python data and to JSON

• Encoding of Python data and JSON to XML

• Data decoding and encoding ruled by converter classes

• An XPath based API for finding schema’s elements and attributes

• Support of XSD validation modes strict/lax/skip

• XML attacks protection using an XMLParser that forbids entities

• Access control on resources addressed by an URL or filesystem path

• Downloading XSD files from a remote URL and storing them for offline use

• XML data bindings based on DataElement class

• Static code generation with Jinja2 templates

Installation

You can install the library with pip in a Python 3.7+ environment:

pip install xmlschema

The library uses the Python’s ElementTree XML library and requires elementpath additional package. The base schemas of the XSD standards are included in the package for working offline and to speed-up the building of schema instances.

Usage

Import the library and then create a schema instance using the path of the file containing the schema as argument:

>>> import xmlschema
>>> my_schema = xmlschema.XMLSchema('tests/test_cases/examples/vehicles/vehicles.xsd')

The schema can be used to validate XML documents:

>>> my_schema.is_valid('tests/test_cases/examples/vehicles/vehicles.xml')
True
>>> my_schema.is_valid('tests/test_cases/examples/vehicles/vehicles-1_error.xml')
False
>>> my_schema.validate('tests/test_cases/examples/vehicles/vehicles-1_error.xml')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/brunato/Development/projects/xmlschema/xmlschema/validators/xsdbase.py", line 393, in validate
    raise error
xmlschema.validators.exceptions.XMLSchemaValidationError: failed validating <Element '{http://example.com/vehicles}cars' at 0x7f8032768458> with XsdGroup(model='sequence').

Reason: character data between child elements not allowed!

Schema:

  <xs:sequence xmlns:xs="http://www.w3.org/2001/XMLSchema">
        <xs:element maxOccurs="unbounded" minOccurs="0" name="car" type="vh:vehicleType" />
  </xs:sequence>

Instance:

  <vh:cars xmlns:vh="http://example.com/vehicles">
    NOT ALLOWED CHARACTER DATA
    <vh:car make="Porsche" model="911" />
    <vh:car make="Porsche" model="911" />
  </vh:cars>

Using a schema you can also decode the XML documents to nested dictionaries, with values that match to the data types declared by the schema:

>>> import xmlschema
>>> from pprint import pprint
>>> xs = xmlschema.XMLSchema('tests/test_cases/examples/collection/collection.xsd')
>>> pprint(xs.to_dict('tests/test_cases/examples/collection/collection.xml'))
{'@xsi:schemaLocation': 'http://example.com/ns/collection collection.xsd',
 'object': [{'@available': True,
             '@id': 'b0836217462',
             'author': {'@id': 'PAR',
                        'born': '1841-02-25',
                        'dead': '1919-12-03',
                        'name': 'Pierre-Auguste Renoir',
                        'qualification': 'painter'},
             'estimation': Decimal('10000.00'),
             'position': 1,
             'title': 'The Umbrellas',
             'year': '1886'},
            {'@available': True,
             '@id': 'b0836217463',
             'author': {'@id': 'JM',
                        'born': '1893-04-20',
                        'dead': '1983-12-25',
                        'name': 'Joan Miró',
                        'qualification': 'painter, sculptor and ceramicist'},
             'position': 2,
             'title': None,
             'year': '1925'}]}

Authors

Davide Brunato and others who have contributed with code or with sample cases.

License

This software is distributed under the terms of the MIT License. See the file ‘LICENSE’ in the root directory of the present distribution, or http://opensource.org/licenses/MIT.