ADOC vs OPML
A detailed comparison of AsciiDoc and OPML Outline — file size, quality, compatibility, and which format to choose for your workflow.
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Technical Specifications
| Specification | .ADOC | .OPML |
|---|---|---|
| MIME type | text/asciidoc | text/x-opml |
| Extensions | .adoc, .asciidoc, .asc | — |
| Processors | AsciiDoc (Python), Asciidoctor (Ruby) | — |
| Stewardship | Eclipse AsciiDoc Working Group | — |
| Output targets | HTML, PDF, EPUB, DocBook, man page | — |
| Extension | — | .opml |
| Format | — | XML with nested <outline> elements |
| Standard | — | OPML 2.0 (2006) |
| Primary use | — | RSS subscription interchange |
Strengths Comparison
.ADOC Strengths
- Expressiveness of DocBook in plain text.
- Cross-references, tables, bibliographies, math, and metadata native.
- Multi-output: HTML, PDF, EPUB, man pages, DocBook XML.
- Faster parsing than LaTeX, richer than Markdown.
- Eclipse Foundation stewardship.
.OPML Strengths
- Standard RSS subscription interchange format.
- Simple XML — easy to parse and generate.
- Highly extensible via arbitrary attributes.
- Supported by every major outline and RSS tool.
Limitations
.ADOC — Limitations
- Steeper learning curve than Markdown.
- Smaller ecosystem than Markdown despite being more capable.
- Most CI tools default to Markdown, not AsciiDoc.
- Authoring WYSIWYG tools are limited.
.OPML — Limitations
- XML verbosity — larger than a JSON-based equivalent.
- Specification is loose — different tools disagree on edge cases.
- Primary use (RSS reading) has shrunk dramatically since Google Reader.
- No strong central stewardship.
Frequently Asked Questions
ADOC (AsciiDoc) is a document format used to store paginated text, with optional formatting, tables, images, hyperlinks, headers and footers. It sits in the documents & text family and is typically associated with a specific office suite or publishing pipeline that defined the format and ships the canonical reader.
OPML (OPML Outline) is a document format used to store paginated text, with optional formatting, tables, images, hyperlinks, headers and footers. It sits in the documents & text family and is typically associated with a specific office suite or publishing pipeline that defined the format and ships the canonical reader.
Modern office suites — Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages — open most ADOC files with reasonable fidelity. If your installed software does not support ADOC, convert to DOCX or PDF first using KaijuConverter; both open in virtually every reader, including free online viewers.
Modern office suites — Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages — open most OPML files with reasonable fidelity. If your installed software does not support OPML, convert to DOCX or PDF first using KaijuConverter; both open in virtually every reader, including free online viewers.
Upload the ADOC to KaijuConverter and pick DOCX, PDF, ODT, RTF, HTML, Markdown, or plain text. Our pipeline runs LibreOffice headlessly plus pandoc for text formats — the same engines behind professional document pipelines. Styles, tables, images, and hyperlinks survive the conversion intact.
Yes, to a high degree. Standard fonts, headings, lists, tables, images, hyperlinks and page structure transfer cleanly. Custom fonts substitute to the closest match if not embedded; obscure layout features unique to ADOC (frames, legacy macros) may flatten to static content in the target format.
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