I suppose you want somthing like this.
import org.openqa.selenium.By
import org.openqa.selenium.WebElement
import com.kms.katalon.core.testobject.ConditionType
import com.kms.katalon.core.testobject.TestObject as TestObject
import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI
TestObject selectorMdCard = new TestObject()
selectorMdCard.addProperty("xpath", ConditionType.EQUALS,
"//div[@id='content']//div[1]//md-card")
// find the list of <md-card> elements
List<WebElement> mdCardList = WebUI.findWebElements(selectorMdCard, 30)
// iterate over the list
for (mdCard in mdCardList) {
// find a <button> in each of the <md-card>
WebElement button = mdCard.findElement(
By.xpath("md-card-actions[1]//md-card-icon-actions[1]//button[1]"))
// this xpath is interpreted as relative to the <md-card> element
// click button
button.click()
}
Selenium WebDriver API is here