FoXyFortran XML Parser

A KISS pure Fortran library for parsing and emitting XML files and tags.

Guide

API Reference

GitHub

📂

Pure Fortran

No C bindings, no wrappers. Pure Fortran 2008+ with object-oriented design.

🌲

Linearised DOM

Parses XML into a flat array-based DOM with full hierarchy tracking — nested and repeated tags supported.

✏️

Emit & Parse

Create tags programmatically, serialise to string or file, or parse from string or file.

🛠️

Multi Build System

Build with fpm (recommended), FoBiS.py, or CMake. Integrate into your fpm project with a single dependency entry.

🧪

OOP / TDD Designed

Two clean types — xml_tag and xml_file — expose all functionality as type-bound procedures, backed by 11 focused automated tests.

🆓

Free & Open Source

Multi-licensed — GPLv3 for FOSS projects, BSD 2/3-Clause or MIT for commercial use. Fortran 2008+ standard compliant.

Quick start

Parse an XML string and query a tag's content:

fortran

use foxy, only: xml_file
type(xml_file)                :: xfile
character(len=:), allocatable :: val

call xfile%parse(string= &
  '<config>'//new_line('A')// &
  '  <dt unit="s">0.01</dt>'//new_line('A')// &
  '  <nstep>1000</nstep>'//new_line('A')// &
  '</config>')

val = xfile%content('dt')
print *, val   ! 0.01

Create and emit a tag programmatically:

fortran

use foxy, only: xml_tag
type(xml_tag) :: tag

tag = xml_tag(name='point', &
              attributes=reshape([['x','1'],['y','2'],['z','3']], [2,3]))
print *, tag%stringify()   ! <point x="1" y="2" z="3"/>

Authors

Stefano Zaghi — @szaghi
Fortran FOSS Programmers - https://github.com/Fortran-FOSS-Programmers

Contributions are welcome — see the Contributing page.

Copyrights

FoXy is distributed under a multi-licensing system:

Use case	License
FOSS projects	GPL v3
Closed source / commercial	BSD 2-Clause
Closed source / commercial	BSD 3-Clause
Closed source / commercial	MIT

Anyone interested in using, developing, or contributing to FoXy is welcome — pick the license that best fits your needs.