[text] additional text-properties for extra border attributes

1. RATIONALE 1.1 Use cases: Borders around pages and paragraphs are already supported by ODF. It's a natural request from the user to be able to have borders around a few characters inside a paragraph as well. This also improves interoperability with HTML or Office Open XML, as both markups have a notion of character borders. 1.2 Alternatives considered: None. 2. REQUESTED CHANGES TO THE ODF STANDARD 2.1 Text changes/additions: Add the appropriate text properties for borders to 16.27.28 <style:text-properties> as following: 16.27.28 <style:text-properties> ... The <style:text-properties> element has the following attributes: ... fo:border 20.176.2, fo:border-bottom 20.176.3 fo:border-left 20.176.4, fo:border-right 20.176.5, fo:border-top 20.176.6, fo:padding 20.210, fo:padding-bottom 20.211,fo:padding-left 20.212, fo:padding-right 20.213, fo:padding-top 20.214, style:border-line-width 20.241, style:border-line-width-bottom 20.242, style:border-line-width-left 20.243, style:border-line-width-right 20.244, style:border-line-width-top 20.245, style:shadow 20.349. Update the reference information accordingly in sections: 20.176.2 fo:border, 20.176.3 fo:border-bottom, 20.176.4 fo:border-left, 20.176.5 fo:border-right, 20.176.6 fo:border-top, 20.211 fo:padding, 20.212 fo:padding-bottom, 20.212 fo:padding-left, 20.213 fo:padding-right, 20.214 fo:padding-top, 20.241 style:border-line-width, 20.242 style:border-line-width-bottom, 20.243 style:border-line-width-left, 20.244 style:border-line-width-right, 20.245 style:border-line-width-top and 20.349 style:shadow. For example, 20.176.2 fo:border The fo:border attribute is usable with the following elements: <style:graphic-properties> 17.21, ..., <style:text-properties> 16.27.28. 2.2 Schema changes/additions: <define name="style-text-properties-attlist"> <interleave> ... <optional> <ref name="common-border-attlist"/> <ref name="common-border-line-width-attlist"/> <ref name="common-padding-attlist"/> <ref name="common-shadow-attlist"/> </optional> ... </interleave> </define> 3. IMPACTS 3.1 Conformance: This proposal will not add any mandatory features or behaviors. 3.2 Backwards compatibility: This element was not available in previous versions and is optional. Existing ODF processors may ignore it. 3.3 Accessibility impact: None.