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From e-commerce solutions to academia intranets and governmental online data sets, there is a growing need for introducing semantics into Internet and intranet sites. With main standards and building technologies defined and maintained by World Wide Web  Consortium, the prospect of building "Web of data" seems promising. Currently, one of main limiting parameters is the amount of semantic content available online, due to complex processes of publishing semantically enriched data. Most of semantic data available today comes from large governmental or industrial sources, with rather high barrier of entrance for smaller organizations that are often using general purpose content management tools. In this article we propose ways of extending widely used open source content management system (CMS) with a semantic layer in order to enable web editors to create semantic web data with minimal additional effort and training. An example implementation is proposed by utilizing open source CMS eZ Publish.