pymods 2.0.12
Utility class wrapping lxml for reading data from MODS v3.4 XML metadata into Python data types.
License: MIT
Keywords: MODS metadata xml

pymods
======

pymods is utility module for working with the Library of Congress's MODS
XML standard: Metadata Description Schema (MODS). It is a utility
wrapper for the lxml module specific to deserializing data out of
MODSXML into python data types.

If you need a module to serialize data into MODSXML, see the other
`pymods by Matt Cordial <https://github.com/cordmata/pymods>`_.

Installing
==========

Recommended:

``pip install pymods``

Using
=====

Basics
------

XML is parsed using the MODSReader class:

``mods_records = pymods.MODSReader('some_file.xml')``

Individual records are stored as an iterator of the MODSRecord object:

.. code:: python

    In [5]: for record in mods_records:
      ....:    print(record)
      ....:
    <Element {http://www.loc.gov/mods/v3}mods at 0x47a69f8>
    <Element {http://www.loc.gov/mods/v3}mods at 0x47fd908>
    <Element {http://www.loc.gov/mods/v3}mods at 0x47fda48>

MODSReader will work with ``mods:modsCollection`` documents, outputs
from OAI-PMH feeds, or individual MODSXML documents with ``mods:mods``
as the root element.

pymods.MODSRecord
^^^^^^^^^^^^^^^^^

The MODSReader class parses each ``mods:mods`` element into a
pymods.MODSRecord object. pymods.MODSRecord is a custom wrapper class
for the lxml.ElementBase class. All children of pymods.Record inherit
the lxml.\_Element and lxml.ElementBase methods.

.. code:: python

    In [6]: record = next(pymods.MODSReader('example.xml'))
    In [7]: print(record.nsmap)
    {'dcterms': 'http://purl.org/dc/terms/', 'xsi': 'http://www.w3.org/2001/XMLSchema-instance', None: 'http://www.loc.gov/mods/v3', 'flvc': 'info:flvc/manifest/v1', 'xlink': 'http://www.w3.org/1999/xlink', 'mods': 'http://www.loc.gov/mods/v3'}

.. code:: python

    In [8]: for child in record.iterdescendants():
      ....:    print(child.tag)

    {http://www.loc.gov/mods/v3}identifier
    {http://www.loc.gov/mods/v3}extension
    {info:flvc/manifest/v1}flvc
    {info:flvc/manifest/v1}owningInstitution
    {info:flvc/manifest/v1}submittingInstitution
    {http://www.loc.gov/mods/v3}titleInfo
    {http://www.loc.gov/mods/v3}title
    {http://www.loc.gov/mods/v3}name
    {http://www.loc.gov/mods/v3}namePart
    {http://www.loc.gov/mods/v3}role
    {http://www.loc.gov/mods/v3}roleTerm
    {http://www.loc.gov/mods/v3}roleTerm
    {http://www.loc.gov/mods/v3}typeOfResource
    {http://www.loc.gov/mods/v3}genre
    ...

Methods
-------

All functions return data either as a string, list, list of named
tuples. See the `API documentation <http://pymods.readthedocs.io>`_ or appropriate docstring for details.

.. code:: python

    >>> record.genre?
    Type:        property
    String form: <property object at 0x0000000004812C78>
    Docstring:
    Accesses mods:genre element.
    :return: A list containing Genre elements with term, authority,
        authorityURI, and valueURI attributes.

Examples
========

Importing

.. code:: python

    from pymods import MODSReader, MODSRecord

Parsing a file

.. code:: python

    In [10]: mods = MODSReader('example.xml')
    In [11]: for record in mods:
       ....:    print(record.dates)
       ....:
    [Date(text='1966-12-08', type='{http://www.loc.gov/mods/v3}dateCreated')]
    None
    [Date(text='1987-02', type='{http://www.loc.gov/mods/v3}dateIssued')]

Simple tasks
------------

Generating a title list

.. code:: python

    In [14]: for record in mods:
       ....:     print(record.titles)
       ....:
    ['Fire Line System']
    ['$93,668.90. One Mill Tax Apportioned by Various Ways Proposed']
    ['Broward NOW News: National Organization for Women, February 1987']

Creating a subject list

.. code:: python

    In [17]: for record in mods:
       ....:     for subject in record.subjects:
       ....:         print(subject.text)
       ....:
    Concert halls
    Architecture
    Architectural drawings
    Structural systems
    Structural systems drawings
    Structural drawings
    Safety equipment
    Construction
    Mechanics
    Structural optimization
    Architectural design
    Fire prevention--Safety measures
    Taxes
    Tax payers
    Tax collection
    Organizations
    Feminism
    Sex discrimination against women
    Women's rights
    Equal rights amendments
    Women--Societies and clubs
    National Organization for Women

More complex tasks
------------------

Creating a list of subject URI's only for LCSH subjects

.. code:: python

    In [18]: for record in mods:
       ....:     for subject in record.subjects:
       ....:         if 'lcsh' == subject.authority:
       ....:             print(subject.uri)
       ....:
    http://id.loc.gov/authorities/subjects/sh85082767
    http://id.loc.gov/authorities/subjects/sh88004614
    http://id.loc.gov/authorities/subjects/sh85132810
    http://id.loc.gov/authorities/subjects/sh85147343

Get URLs for objects using a No Copyright US rightsstatement.org URI

.. code:: python

    In [23]: for record in mods:
       ....:     for rights_elem in record.rights
       ....:         if rights_elem.uri == 'http://rightsstatements.org/vocab/NoC-US/1.0/':
       ....:             print(record.purl)
       ....:
    http://purl.flvc.org/fsu/fd/FSU_MSS0204_B01_F10_09
    http://purl.flvc.org/fsu/fd/FSU_MSS2008003_B18_F01_004

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