Introduction to `elementpath`

elementpath is a versatile and powerful library for parsing, querying, and manipulating XML data in Python. It offers a rich set of APIs that make working with XML straightforward and efficient. This guide will introduce you to various elementpath APIs through explanations and code snippets.

Basic Usage

Parsing an XML Document

    import elementpath
    root = elementpath.parse('data')
    print(root.tag)  # Output: root

Evaluating XPath Expressions

    result = elementpath.select(root, '/root/child')
    for node in result:
        print(node.text)  # Output: data

Finding Elements

    child = elementpath.find(root, 'child')
    print(child.tag)  # Output: child

Advanced Usage

Registering Namespaces

    namespaces = {'x': 'http://example.com'}
    root = elementpath.parse('data')
    result = elementpath.select(root, '/root/x:child', namespaces=namespaces)
    for node in result:
        print(node.tag)  # Output: {http://example.com}child

Using Functions in XPath

    result = elementpath.select(root, 'count(/root/child)')
    print(result)  # Output: 1

XML Schema Validation

    xmlschema = '''
                      
                   '''
    schema = elementpath.XMLSchema(xmlschema)
    root = elementpath.parse('data')
    is_valid = schema.validate(root)
    print(is_valid)  # Output: True

Example Application

This example demonstrates a simple XML processing application that reads an XML file, validates it against a schema, and performs XPath queries to extract specific information.

    import elementpath

    xml_data = '''
                      Item 1
                      Item 2
                  '''

    xmlschema = '''
                      
                        
                          
                            
                          
                        
                      
                   '''

    schema = elementpath.XMLSchema(xmlschema)
    root = elementpath.parse(xml_data)

    if schema.validate(root):
        print("XML is valid!")

    items = elementpath.select(root, './/x:item', namespaces={'x': 'http://example.com'})
    for item in items:
        print(item.text)

With the elementpath library, processing XML in Python becomes seamless and efficient. Whether you’re dealing with basic parsing or complex schema validation, elementpath has got you covered.

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