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Interoperability is greatly considered in e-learning systems. XML based standards have arisen facilitating the common methods of description, identification and search of LO which are developed under different formats and platforms thus guaranteeing their reusability.

SCORM standard is imposing in this field. It was developed by Advanced Distributed Learning [6] and based on proposals of organizations like IEEE Learning Technology Standards Committee [10] Learning Object Metadata Working Group and IMS Global Learning Consortium.

The most modern e-learning platforms use the standards previously mentioned to achieve interoperability among the different systems. Nevertheless, there is much useful content available in different environments that is not structured according to the standards. This provokes serious difficulties for them to be reused. That is why it is essential to look for alternatives that permit to pack such contents in a way that they may be imported and used in the existing platforms.

An automated procedure that allows the making of Digital Libraries composed of learning objects starting from previously developed content structures is proposed. Tools for facilitating this process have been developed.

It has been applied to contents developed on a platform for teaching Spanish, as a result we have obtained a Multimedia Digital Library of Learning Objects.