Correction: XMI is a meta-data standard (Score 1)

The title is right, but the content is wrong. XML is not a meta-data standard. XML just provides the syntax, not the semantics. And Metadata needs semantics. What I said is that XMI is a meta-data standard. It's not a generic metadata standard for describing web resources like Dublin Core or IAFA. XMI is more suited for coding in XML the metadata of OO development tools. In the ISO metadata architecture, metadata standards are grouped in 4 levels, according to what they can describe. As much as UML (level 3) is a metadata standard for describing OO models, MOF (level 4) is a metadata standard for describing metamodels like UML. But MOF is not limited to UML. It can be used to describe entity-relationship models, data warehouse models, component models and even generic metadata. XMI is a mechanism for mapping ANY meta-model which can be described by MOF in XML. One might object that it's not a metadata standard because it cannot by itself describe anything without a meta-meta-model like MOF behind the scenes. I think this objection is useless. There are metadata standards for description, like MOF, and metadata standards for encoding, like XMI.