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      <subfield code="a">Vega, Ricard de la</subfield>
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      <subfield code="a">Torres, Natalia</subfield>
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      <subfield code="a">Empowering Communities with a Heritage Open Ecosystem (ECHOES) is a project that intends to provide an open-source and modular architecture to gather different digital contents related to European heritage.
When a wide amount of heterogeneous data of collections, disciplines and countries are joined, different kinds of technical challenges must be considered. In this article are detailed these challenges and the approaches that have been used, with more or less success, to solve it.</subfield>
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      <subfield code="a">Technical Challenges and Approaches to build an Open Ecosystem of Heterogeneous Heritage Collections</subfield>
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