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Basic example of using HTML+RDFa for annotating MathML
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| <html> | |
| <body vocab="http://purl.org/dc/terms/"> | |
| <math property="subject" content="linear-algebra" typeof=""> | |
| <mi property="description" content="prime-number" typeof="">n</mi> | |
| <mo property="description" content="scalar-multiplication"></mo> | |
| <msup> | |
| <mi property="description" content="matrix" typeof="">A</mi> | |
| <mi property="description" content="transpose" typeof="">T</mi> | |
| </msup> | |
| </math> | |
| </body> | |
| </html> |
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| [ | |
| { | |
| "@id": "_:Nf768098632bd4b099f61b1f66cd8abbe", | |
| "http://purl.org/dc/terms/description": [ | |
| { | |
| "@value": "prime-number" | |
| } | |
| ] | |
| }, | |
| { | |
| "@id": "_:N408a0e4f025045cc933c4a10f49e5de0", | |
| "http://purl.org/dc/terms/description": [ | |
| { | |
| "@value": "matrix" | |
| } | |
| ] | |
| }, | |
| { | |
| "@id": "_:Ncdd1f89f11754343a3827bb4c7974faf", | |
| "http://purl.org/dc/terms/description": [ | |
| { | |
| "@value": "transpose" | |
| } | |
| ] | |
| }, | |
| { | |
| "@id": "", | |
| "http://www.w3.org/ns/rdfa#usesVocabulary": [ | |
| { | |
| "@id": "http://purl.org/dc/terms/" | |
| } | |
| ] | |
| }, | |
| { | |
| "@id": "_:N58dfa990909f4113ad6fe25f2a54f355", | |
| "http://purl.org/dc/terms/description": [ | |
| { | |
| "@value": "scalar-multiplication" | |
| } | |
| ], | |
| "http://purl.org/dc/terms/subject": [ | |
| { | |
| "@value": "linear-algebra" | |
| } | |
| ] | |
| } | |
| ] |
The annotations can be doubtlessly improved in multiple ways - better vocabulary, better use of the vocabulary, better granularity, better interop with existing browser indexing solutions... The main question this Gist wants to pose is whether RDFa is the right specification for this information to reside in.
Here are the current structured data policies of Google, which indicate focusing on using the schema.org vocabualry, and a preference to coarse-grained metadata via JSON-LD, rather than the fine-grained example I added here. Here is one example for a recipe webpage with structured annotations.
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Rendered MathML+RDFa formula by Firefox:
Is this sufficient for baseline search-friendly markup? Are there additional markup needs on the MathML tree itself for search to be fully aided?