18. The computer-readable medium of claim 17 , wherein the credentials include a uniform resource locator (URL) of the transcluded file and an identifier of the transcluded template.
19. The computer-readable medium of claim 18 , wherein the instructions that cause the building the transcluded template object and the transcluding template object, comprise instructions that, when executed by the computing device, cause the computing device to perform operations comprising: validating that the transcluded file is accessible using the URL; and validating that the transcluded template exists in the transcluded file using the identifier.