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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _annotation_stmt(self, stmt: Statement, sctx: SchemaContext) -> None: """Handle annotation statement."""

        if not sctx.schema_data.if_features(stmt, sctx.text_mid):
            return
        dst = stmt.find1("description")
        self.annotations[(stmt.argument, sctx.default_ns)] = Annotation(
            DataType._resolve_type(stmt.find1("type", required=True), sctx),
            dst.argument if dst else None)