triplate 0.4.0

A templating engine for SPARQL queries with typed, injection-safe placeholders and loops

Triplate (Python)

A templating engine for RDF query & data languages (SPARQL, Turtle, …) with a typed --- frontmatter header, injection-safe values, loops and conditionals. Python reference implementation of the Triplate language.

from triplate import compile

template = """\
---
params {
  classes: iri[] min 1
  limit:   int optional
}
---
SELECT ?s WHERE {
{% for c in classes join "UNION" %}
  { ?s a ${c} }
{% endfor %}
}
{% if limit %}LIMIT ${limit}{% endif %}
"""

tmpl = compile(template)
sparql = tmpl.render(classes=["http://example.org/Person"], limit=10)

Every input is declared in the mandatory --- frontmatter header with its RDF type; the context is validated and each value escaped accordingly, so rendered output is injection-safe and an unprocessed template fails fast.

See triplate.dev for the full guide and specification.