My site is https://www.liteshop.com.au/content/olight-h15s-wave-rechargeable-led-headlamp
We implemented rich snippets on my site seven weeks ago but still Google does n
@unor is correct and your syntax is correct. If you changed to schema.org, you would encounter another problem. Google will not accept content=" ". The value for content must be in the clear, i.e term">content_value</term"
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You are using the vocabularies GoodRelations and Data-Vocabulary.org.
According to Google’s technical guidelines for structured data, they support only¹ the vocabulary Schema.org:
Structured data should be expressed using the most specific applicable type and property names defined by schema.org.
¹ Data-Vocabulary.org was used for their Rich Snippets before; I don’t know if they still support it, but it seems that they don’t document it anymore.