lxml Builder

Generates XML/HTML strings using lxml builder semantics from structured input, enabling repeatable payload creation for tests, fixtures, and automated document generation in Python projects.

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About This Tool

This tool converts a structured, data-driven description into an XML/HTML document by applying lxml.builder-like semantics. It accepts a root_tag, optional attributes, and a recursively defined list of children, then emits a well-formed string. Conceptually, it treats the input as a tree description and maps each node to an element, optionally attaching text, tail text, and namespaces. The primary beneficiaries are developers building APIs, test fixtures, data feeds, or any workflow that requires reliable, repeatable XML payloads without manual string concatenation. Unique value lies in aligning a concise, nested description with the lxml builder API, enabling both XML and HTML-like trees to be produced deterministically. Core features include: recursive element creation, attribute handling, optional text content, namespace support, and controllable pretty-printing. Use cases span API payloads, configuration documents, and test data generation for Python projects. The tool emphasizes correctness, determinism, and integration with Python tooling, rather than UI generation or client-side rendering.

How to Use

  1. Provide inputs: root_tag, optional attributes, and optional text content.
  2. Define children as nested dictionaries/lists describing tag, attributes, text and further children.
  3. Optionally enable namespaces and pretty printing for readability.
  4. Run generation to produce xml_string.
  5. Validate well-formedness and export for tests, fixtures, or data pipelines.
How to use lxml builder

Frequently Asked Questions

Find Quick Answers

What formats can be generated by the tool?
The tool outputs XML strings by default and can render HTML-like structures when tag names and nesting resemble HTML. It follows XML well-formedness rules and can include an XML declaration if requested.
How are inputs represented?
Inputs are described as a root_tag string, an optional attributes dictionary, optional text for the node, and a list of children defined with the same shape recursively. This mirrors an element tree rather than raw strings.
Can I use namespaces?
Yes. The input can specify namespace mappings and prefixed tags. The generator will declare the nsmap and qualify tags accordingly to produce valid namespaced XML.
What validation is performed?
Validation checks for non-empty root_tag, valid XML tag names, correct attribute types, and a safe recursion depth. It does not perform DTD/XSD validation or network I/O.

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