/// <summary>
/// Trys to create an OpenXmlElement from the specified namespace URI and local name.
/// </summary>
/// <param name="parent">The parent element.</param>
/// <param name="fileFormat">The specified file format version.</param>
/// <param name="namespaceUri">The namespace URI of the requested child element.</param>
/// <param name="localName">The local name of the requested child element.</param>
/// <returns>A new OpenXmlElement if the parent element can contains a child with the specified namespace and local name. Otherwise, returns null.</returns>
internal static OpenXmlElement?TryCreateValidChild(this OpenXmlElement parent, FileFormatVersions fileFormat, string namespaceUri, string localName)
{
Debug.Assert(parent is OpenXmlCompositeElement);
var newElement = parent.CreateElement(OpenXmlQualifiedName.Create(namespaceUri, string.Empty, localName));
if (newElement is OpenXmlUnknownElement || !newElement.IsInVersion(fileFormat))
{
return(null);
}
return(newElement);
}
