Bridging Scales and Paradigms in Natural Systems Modeling -- Analyzing Hidden Semantics in Social Bookmarking of Open Educational Resources -- Case Studies of Ecological Integrative Information Systems: The Luquillo and Sevilleta Information Management Systems -- Agrotags – A Tagging Scheme for Agricultural Digital Objects -- Application Profiling for Rural Communities: eGov Services and Training Resources in Rural Inclusion -- Developing a Diagnosis Aiding Ontology Based on Hysteroscopy Image Processing -- Utilizing Embedded Semantics for User-Driven Design of Pervasive Environments -- Utilizing Linked Open Data Sources for Automatic Generation of Semantic Metadata -- Application of Semantic Tagging to Generate Superimposed Information on a Digital Encyclopedia -- Mapping of Core Components Based e-Business Standards into Ontology -- Model-Driven Knowledge-Based Development of Expected Answer Type Taxonomies for Restricted Domain Question Answering -- Using a Semantic Wiki for Documentation Management in Very Small Projects -- A Short Communication - Meta Data and Semantics the Industry Interface: What Does the Food Industry Think Are Necessary Elements for Exchange? -- Social Ontology Documentation for Knowledge Externalization -- Information Enrichment Using TaToo’s Semantic Framework -- Exploiting CReP for Knowledge Retrieval and Use in Complex Domains -- Quality Requirements of Migration Metadata in Long-Term Digital Preservation Systems -- A Model for Integration and Interlinking of Idea Management Systems -- An Enterprise Ontology Building the Bases for Automatic Metadata Generation -- Matching SKOS Thesauri for Spatial Data Infrastructures -- Sharing Epigraphic Information as Linked Data -- Development Issues on Linked Data Weblog Enrichment -- On Modeling Research Work for Describing and Filtering Scientific Information -- Localisation Standards and Metadata -- The Design of an Automated Workflow for Metadata Generation -- Assessing Quality of Data Standards: Framework and Illustration Using XBRL GAAP Taxonomy -- Brazilian Proposal for Agent-Based Learning Objects Metadata Standard - OBAA -- Towards Quality Measures for Evaluating Thesauri -- Enriching the Description of Learning Resources on Disaster Risk Reduction in the Agricultural Domain: An Ontological Approach -- Descriptive Analysis of Learning Object Material Types in MERLOT -- Quality in Learning Objects: Evaluating Compliance with Metadata Standards -- The Benefits and Future of Standards: Metadata and Beyond.

This volume constitutes the selected papers of the fourth international conference on Metadata and Semantic Research, MTSR 2010, held in Alcalá de Henares, Spain, in October 2010. The 28 full papers presented together with 3 invited lectures were carefully reviewed and selected from numerous submissions. The papers focus on theoretical and practical aspects of metadata research in a broad sense: models, languages, standards, applications, etc. and also on the application of Semantic Web technologies or any other kind of advanced metadata expression language to Web applications. They cover a wide range, from formal papers to empirical studies, including different kind of application and technology reports as well as user studies.