code: func (c *Catalog) Connect(service, tag string, q *QueryOptions) ([]*CatalogService, *QueryMeta, error) {
  	var tags []string
  	if tag != "" {
  		tags = []string{tag}
  	}
  	return c.service(service, tags, q, true)
  }
docs: // Connect is used to query catalog entries for a given Connect-enabled service