hed_schema_io

Utilities for loading and outputting HED schema.

Functions

from_string(schema_string[, schema_format, ...])	Create a schema from the given string.
get_hed_xml_version(xml_file_path)	Get the version number from a HED XML file.
load_schema(hed_path[, schema_namespace, ...])	Load a schema from the given file or URL path.
load_schema_version([xml_version, xml_folder])	Return a HedSchema or HedSchemaGroup extracted from xml_version
parse_version_list(xml_version_list)	Takes a list of xml versions and returns a dictionary split by prefix

from_string(schema_string, schema_format='.xml', schema_namespace=None, schema=None, name=None)

Create a schema from the given string.

Parameters:

• schema_string (str) – An XML, mediawiki or OWL, file as a single long string

• schema_format (str) – The schema format of the source schema string. Allowed normal values: .mediawiki, .xml Allowed owl values: xml, owl, pretty-xml, turtle (or any other value rdflib supports)

• schema_namespace (str, None) – The name_prefix all tags in this schema will accept.

• schema (HedSchema or None) – A hed schema to merge this new file into It must be a with-standard schema with the same value.

• name (str or None) – User supplied identifier for this schema

Returns:

The loaded schema.

Return type:

(HedSchema)

Raises:

HedFileError –

• If empty string or invalid extension is passed.

• Other fatal formatting issues with file

Notes

• The loading is determined by file type.

get_hed_xml_version(xml_file_path)

Get the version number from a HED XML file.

Parameters:

xml_file_path (str) – The path to a HED XML file.

Returns:

The version number of the HED XML file.

Return type:

str

Raises:

HedFileError –

• There is an issue loading the schema

load_schema(hed_path, schema_namespace=None, schema=None, file_format=None, name=None)

Load a schema from the given file or URL path.

Parameters:

• hed_path (str) – A filepath or url to open a schema from.

• schema_namespace (str or None) – The name_prefix all tags in this schema will accept.

• schema (HedSchema or None) – A hed schema to merge this new file into It must be a with-standard schema with the same value.

• file_format (str or None) – Required for owl formatted files other than the following: .ttl: turtle .owl: xml .json-ld: json-ld

• name (str or None) – User supplied identifier for this schema

Returns:

The loaded schema.

Return type:

HedSchema

Raises:

HedFileError –

• Empty path passed

• Unknown extension

• Any fatal issues when loading the schema.

load_schema_version(xml_version=None, xml_folder=None)

Return a HedSchema or HedSchemaGroup extracted from xml_version

Parameters:

• xml_version (str or list) – List or str specifying which official HED schemas to use. A json str format is also supported, based on the output of HedSchema.get_formatted_version Basic format: [schema_namespace:][library_name_]X.Y.Z.

• xml_folder (str) – Path to a folder containing schema.

Returns:

The schema or schema group extracted.

Return type:

HedSchema or HedSchemaGroup

Raises:

HedFileError –

• The xml_version is not valid.

• The specified version cannot be found or loaded

• Other fatal errors loading the schema (These are unlikely if you are not editing them locally)

• The prefix is invalid

parse_version_list(xml_version_list)

Takes a list of xml versions and returns a dictionary split by prefix

e.g. [“score”, “testlib”] will return {“”: “score, testlib”} e.g. [“score”, “testlib”, “ol:otherlib”] will return {“”: “score, testlib”, “ol:”: “otherlib”}

Parameters:

xml_version_list (list) – List of str specifying which hed schemas to use

Returns:

The schema or schema group extracted.

Return type:

HedSchema or HedSchemaGroup