And while some types of property are excluded, the 2010 law expands the list of qualifying property.

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One suggestion, supported by telecoms firms, consumer groups and Internet activists, is that the section covering intellectual property should be excluded from the convention, so that the agreement applies only to disputes over the sale of goods and services.

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However, developers have been excluded from these charges due the property crash which has left a number with large portfolios of unsold homes.

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Repossessions and property transfers following a divorce are excluded to avoid skewing the sample.

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Repossessions and property transfers following a divorce are also excluded to avoid skewing the sample.

BBC: House price surveys explained