. Author manuscript; available in PMC: 2017 May 31.

Published in final edited form as: J Integr Bioinform. 2015 Sep 4;12(2):268. doi: 10.2390/biecoll-jib-2015-268

Table 2.

Procedures for using the md5 attribute on ExternalModelDefinition.

Case	Procedure
Creating and writing an SBML document	Compute the MD5 hash for the document located at `source`. Store the hash value as the value of the `md5` attribute.
Reading an SBML document	Read the value of the `md5` attribute. Read the document at the location indicated by the `source` attribute value. Compute the MD5 hash for the document. Compare the computed MD5 value to the value in the `md5` attribute. If they are identical, assume the document has not changed since the time the ExternalModelDefinition object was defined; if the values are different, assume that the document indicated by `source` has changed.

Case

Procedure

Creating and writing an SBML document

Reading an SBML document

Read the value of the md5 attribute.
Read the document at the location indicated by the source attribute value.
Compute the MD5 hash for the document.
Compare the computed MD5 value to the value in the md5 attribute. If they are identical, assume the document has not changed since the time the ExternalModelDefinition object was defined; if the values are different, assume that the document indicated by source has changed.