7. A computer program product comprising a computer readable hardware storage device having computer readable program code stored therein, wherein the computer readable program code upon being executed by a processor of a first computer implements a method for verifying resource content, said method comprising: computing a first characteristic of the content of a resource stored at a second computer coupled to the first computer via a communication infrastructure; creating, in a markup language document, a markup element comprising the computed first characteristic and a resource indicator that references the resource, said markup language document being stored at the first computer; extracting the first characteristic from the markup element in the markup language document that is stored at the first computer; retrieving the resource from the second computer according to the resource indicator; generating a second characteristic of the content of the retrieved resource; ascertaining that the second characteristic is identical to the first characteristic; responsive to said ascertaining, processing the retrieved resource, wherein said generating the second characteristic comprises computing a hash of the content of the retrieved resource according to a particular hash algorithm, wherein said creating the markup element comprises: including the resource indicator in the markup element; computing the first characteristic by computing, according to the particular hash algorithm, a hash of the content of the resource referenced by the resource indicator; and including the computed first characteristic in the markup element, wherein said creating the markup element results in the markup element comprising a first attribute-value pair and a second attribute-value pair, wherein the first attribute-value pair and the second attribute-value pair are within distinct non-overlapping portions of the markup element, wherein the first attribute-value pair comprises both a first attribute denoting the resource indicator and a value pertaining to the first attribute, said value pertaining to the first attribute consisting of a first character string that consists of the resource indicator, wherein the second attribute-value pair comprises both a second attribute denoting the first characteristic and a value pertaining to the second attribute, said value pertaining to the second attribute consisting of a second character string that comprises an identifier of the particular hash algorithm and the generated first characteristic, and wherein the first attribute and the second attribute are different attributes.
7. A computer program product comprising a computer readable hardware storage device having computer readable program code stored therein, wherein the computer readable program code upon being executed by a processor of a first computer implements a method for verifying resource content, said method comprising: computing a first characteristic of the content of a resource stored at a second computer coupled to the first computer via a communication infrastructure; creating, in a markup language document, a markup element comprising the computed first characteristic and a resource indicator that references the resource, said markup language document being stored at the first computer; extracting the first characteristic from the markup element in the markup language document that is stored at the first computer; retrieving the resource from the second computer according to the resource indicator; generating a second characteristic of the content of the retrieved resource; ascertaining that the second characteristic is identical to the first characteristic; responsive to said ascertaining, processing the retrieved resource, wherein said generating the second characteristic comprises computing a hash of the content of the retrieved resource according to a particular hash algorithm, wherein said creating the markup element comprises: including the resource indicator in the markup element; computing the first characteristic by computing, according to the particular hash algorithm, a hash of the content of the resource referenced by the resource indicator; and including the computed first characteristic in the markup element, wherein said creating the markup element results in the markup element comprising a first attribute-value pair and a second attribute-value pair, wherein the first attribute-value pair and the second attribute-value pair are within distinct non-overlapping portions of the markup element, wherein the first attribute-value pair comprises both a first attribute denoting the resource indicator and a value pertaining to the first attribute, said value pertaining to the first attribute consisting of a first character string that consists of the resource indicator, wherein the second attribute-value pair comprises both a second attribute denoting the first characteristic and a value pertaining to the second attribute, said value pertaining to the second attribute consisting of a second character string that comprises an identifier of the particular hash algorithm and the generated first characteristic, and wherein the first attribute and the second attribute are different attributes. 12. The computer program product of claim 7 , wherein said processing the retrieved resource comprises displaying the retrieved resource.